231221210120 has 16 divisors (see below), whose sum is σ = 520247722860. Its totient is φ = 92488484032.

The previous prime is 231221210107. The next prime is 231221210161. The reversal of 231221210120 is 21012122132.

It can be written as a sum of positive squares in 2 ways, for example, as 194733333796 + 36487876324 = 441286^2 + 191018^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2890265087 + ... + 2890265166.

Almost surely, 2^231221210120 is an apocalyptic number.

231221210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231221210120 is an abundant number, since it is smaller than the sum of its proper divisors (289026512740).

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

231221210120 is a wasteful number, since it uses less digits than its factorization.

231221210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5780530264 (or 5780530260 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 231221210120 its reverse (21012122132), we get a palindrome (252233332252).

The spelling of 231221210120 in words is "two hundred thirty-one billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty".