231221202121120 has 48 divisors (see below), whose sum is σ = 563881383249408. Its totient is φ = 89504981464320.

The previous prime is 231221202121099. The next prime is 231221202121127. The reversal of 231221202121120 is 21121202122132.

It is a junction number, because it is equal to n+sod(n) for n = 231221202121091 and 231221202121100.

It is not an unprimeable number, because it can be changed into a prime (231221202121127) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 23308583964 + ... + 23308593883.

It is an arithmetic number, because the mean of its divisors is an integer number (11747528817696).

Almost surely, 2^{231221202121120} is an apocalyptic number.

231221202121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231221202121120 is an abundant number, since it is smaller than the sum of its proper divisors (332660181128288).

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

231221202121120 is a wasteful number, since it uses less digits than its factorization.

231221202121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46617177893 (or 46617177885 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 231221202121120 its reverse (21121202122132), we get a palindrome (252342404243252).

The spelling of 231221202121120 in words is "two hundred thirty-one trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty-one thousand, one hundred twenty".