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1220210121 = 31331287439
BaseRepresentation
bin100100010111010…
…1110110111001001
310011001001002121110
41020232232313021
54444333210441
6321025200533
742144420624
oct11056566711
93131032543
101220210121
1157685aa19
122a0790149
13165a4c430
14b80b0dbb
15721cdb16
hex48baedc9

1220210121 has 8 divisors (see below), whose sum is σ = 1752096640. Its totient is φ = 750898512.

The previous prime is 1220210107. The next prime is 1220210129. The reversal of 1220210121 is 1210120221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220210121 - 27 = 1220209993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220210097 and 1220210106.

It is not an unprimeable number, because it can be changed into a prime (1220210129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15643681 + ... + 15643758.

It is an arithmetic number, because the mean of its divisors is an integer number (219012080).

Almost surely, 21220210121 is an apocalyptic number.

It is an amenable number.

1220210121 is a deficient number, since it is larger than the sum of its proper divisors (531886519).

1220210121 is a wasteful number, since it uses less digits than its factorization.

1220210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31287455.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1220210121 is about 34931.5061370105. The cubic root of 1220210121 is about 1068.5910710360.

Adding to 1220210121 its reverse (1210120221), we get a palindrome (2430330342).

The spelling of 1220210121 in words is "one billion, two hundred twenty million, two hundred ten thousand, one hundred twenty-one".

Divisors: 1 3 13 39 31287439 93862317 406736707 1220210121