21131022112 has 12 divisors (see below), whose sum is σ = 41601699846. Its totient is φ = 10565511040.

The previous prime is 21131022109. The next prime is 21131022119. The reversal of 21131022112 is 21122013112.

It can be written as a sum of positive squares in only one way, i.e., 10766967696 + 10364054416 = 103764^2 + 101804^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21131022119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330172189 + ... + 330172252.

Almost surely, 2^21131022112 is an apocalyptic number.

It is an amenable number.

21131022112 is a deficient number, since it is larger than the sum of its proper divisors (20470677734).

21131022112 is an equidigital number, since it uses as much as digits as its factorization.

21131022112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660344451 (or 660344443 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21131022112 its reverse (21122013112), we get a palindrome (42253035224).

The spelling of 21131022112 in words is "twenty-one billion, one hundred thirty-one million, twenty-two thousand, one hundred twelve".