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221221430 = 25107206749
BaseRepresentation
bin11010010111110…
…01001000110110
3120102021012202022
431023321020312
5423113041210
633541313142
75324231303
oct1513711066
9512235668
10221221430
11103967a31
12621057b2
1336aa7671
14215480aa
151464c155
hexd2f9236

221221430 has 16 divisors (see below), whose sum is σ = 401922000. Its totient is φ = 87661152.

The previous prime is 221221423. The next prime is 221221447. The reversal of 221221430 is 34122122.

It is a junction number, because it is equal to n+sod(n) for n = 221221399 and 221221408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102305 + ... + 104444.

It is an arithmetic number, because the mean of its divisors is an integer number (25120125).

Almost surely, 2221221430 is an apocalyptic number.

221221430 is a deficient number, since it is larger than the sum of its proper divisors (180700570).

221221430 is a wasteful number, since it uses less digits than its factorization.

221221430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206863.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 221221430 is about 14873.5143795944. The cubic root of 221221430 is about 604.7962157732.

Adding to 221221430 its reverse (34122122), we get a palindrome (255343552).

The spelling of 221221430 in words is "two hundred twenty-one million, two hundred twenty-one thousand, four hundred thirty".

Divisors: 1 2 5 10 107 214 535 1070 206749 413498 1033745 2067490 22122143 44244286 110610715 221221430