231221002122 has 48 divisors (see below), whose sum is σ = 546713024832. Its totient is φ = 70042527360.

The previous prime is 231221002109. The next prime is 231221002139. The reversal of 231221002122 is 221200122132.

231221002122 is a `hidden beast` number, since 231 + 221 + 0 + 0 + 212 + 2 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 231221002095 and 231221002104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 369378 + ... + 773874.

It is an arithmetic number, because the mean of its divisors is an integer number (11389854684).

Almost surely, 2^231221002122 is an apocalyptic number.

231221002122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

231221002122 is an abundant number, since it is smaller than the sum of its proper divisors (315492022710).

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

231221002122 is a wasteful number, since it uses less digits than its factorization.

231221002122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407403 (or 407400 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 231221002122 its reverse (221200122132), we get a palindrome (452421124254).

The spelling of 231221002122 in words is "two hundred thirty-one billion, two hundred twenty-one million, two thousand, one hundred twenty-two".