21231286112 has 24 divisors (see below), whose sum is σ = 42587760096. Its totient is φ = 10415347072.

The previous prime is 21231286093. The next prime is 21231286117. The reversal of 21231286112 is 21168213212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231286117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6257528 + ... + 6260919.

It is an arithmetic number, because the mean of its divisors is an integer number (1774490004).

Almost surely, 2^21231286112 is an apocalyptic number.

It is an amenable number.

21231286112 is an abundant number, since it is smaller than the sum of its proper divisors (21356473984).

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

21231286112 is a wasteful number, since it uses less digits than its factorization.

21231286112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12518510 (or 12518502 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

Adding to 21231286112 its reverse (21168213212), we get a palindrome (42399499324).

The spelling of 21231286112 in words is "twenty-one billion, two hundred thirty-one million, two hundred eighty-six thousand, one hundred twelve".