21331232112 has 40 divisors (see below), whose sum is σ = 57005882640. Its totient is φ = 6865223680.

The previous prime is 21331232077. The next prime is 21331232129. The reversal of 21331232112 is 21123213312.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 7660689 + ... + 7663472.

It is an arithmetic number, because the mean of its divisors is an integer number (1425147066).

Almost surely, 2^21331232112 is an apocalyptic number.

It is an amenable number.

21331232112 is an abundant number, since it is smaller than the sum of its proper divisors (35674650528).

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

21331232112 is a wasteful number, since it uses less digits than its factorization.

21331232112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15324201 (or 15324195 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 21331232112 its reverse (21123213312), we get a palindrome (42454445424).

It can be divided in two parts, 21 and 331232112, that added together give a palindrome (331232133).

The spelling of 21331232112 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirty-two thousand, one hundred twelve".