21131101012 has 48 divisors (see below), whose sum is σ = 43007052928. Its totient is φ = 8896936320.

The previous prime is 21131101003. The next prime is 21131101039. The reversal of 21131101012 is 21010113112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21131100983 and 21131101001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1490863 + ... + 1504969.

Almost surely, 2^21131101012 is an apocalyptic number.

It is an amenable number.

21131101012 is an abundant number, since it is smaller than the sum of its proper divisors (21875951916).

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

21131101012 is a wasteful number, since it uses less digits than its factorization.

21131101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15056 (or 15054 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21131101012 its reverse (21010113112), we get a palindrome (42141214124).

The spelling of 21131101012 in words is "twenty-one billion, one hundred thirty-one million, one hundred one thousand, twelve".