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1222221220 = 225117737187
BaseRepresentation
bin100100011011001…
…1001110110100100
310011011211021022121
41020312121312210
510000342034340
6321140235324
742200465113
oct11066316644
93134737277
101222221220
11577a03990
122a139bb44
131662a492c
14b8475c7a
157247994a
hex48d99da4

1222221220 has 48 divisors (see below), whose sum is σ = 2804010048. Its totient is φ = 443807360.

The previous prime is 1222221197. The next prime is 1222221233. The reversal of 1222221220 is 221222221.

It is a junction number, because it is equal to n+sod(n) for n = 1222221194 and 1222221203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166467 + ... + 173653.

It is an arithmetic number, because the mean of its divisors is an integer number (58416876).

Almost surely, 21222221220 is an apocalyptic number.

1222221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222221220 is an abundant number, since it is smaller than the sum of its proper divisors (1581788828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222221220 is a wasteful number, since it uses less digits than its factorization.

1222221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7980 (or 7978 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1222221220 is about 34960.2806052812. The cubic root of 1222221220 is about 1069.1778177565.

Adding to 1222221220 its reverse (221222221), we get a palindrome (1443443441).

The spelling of 1222221220 in words is "one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty".

Divisors: 1 2 4 5 10 11 20 22 44 55 110 220 773 1546 3092 3865 7187 7730 8503 14374 15460 17006 28748 34012 35935 42515 71870 79057 85030 143740 158114 170060 316228 395285 790570 1581140 5555551 11111102 22222204 27777755 55555510 61111061 111111020 122222122 244444244 305555305 611110610 1222221220