21231131032012 has 24 divisors (see below), whose sum is σ = 40623653996352. Its totient is φ = 9628729640400.

The previous prime is 21231131031961. The next prime is 21231131032021. The reversal of 21231131032012 is 21023013113212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544591914 + ... + 544630897.

It is an arithmetic number, because the mean of its divisors is an integer number (1692652249848).

Almost surely, 2^{21231131032012} is an apocalyptic number.

21231131032012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21231131032012 is a deficient number, since it is larger than the sum of its proper divisors (19392522964340).

21231131032012 is a wasteful number, since it uses less digits than its factorization.

21231131032012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089223269 (or 1089223267 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21231131032012 its reverse (21023013113212), we get a palindrome (42254144145224).

The spelling of 21231131032012 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred thirty-one million, thirty-two thousand, twelve".