231221100120102 has 48 divisors (see below), whose sum is σ = 512632802764368. Its totient is φ = 75280836556800.

The previous prime is 231221100120047. The next prime is 231221100120103. The reversal of 231221100120102 is 201021001122132.

231221100120102 is a `hidden beast` number, since 231 + 2 + 211 + 0 + 0 + 120 + 102 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231221100120103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143062102 + ... + 144669302.

It is an arithmetic number, because the mean of its divisors is an integer number (10679850057591).

Almost surely, 2^{231221100120102} is an apocalyptic number.

231221100120102 is an abundant number, since it is smaller than the sum of its proper divisors (281411702644266).

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

231221100120102 is a wasteful number, since it uses less digits than its factorization.

231221100120102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793125 (or 1793122 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 231221100120102 its reverse (201021001122132), we get a palindrome (432242101242234).

The spelling of 231221100120102 in words is "two hundred thirty-one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty thousand, one hundred two".