21311425236 has 24 divisors (see below), whose sum is σ = 50407848064. Its totient is φ = 7006495680.

The previous prime is 21311425231. The next prime is 21311425237. The reversal of 21311425236 is 63252411312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311425231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12163180 + ... + 12164931.

Almost surely, 2^21311425236 is an apocalyptic number.

It is an amenable number.

21311425236 is an abundant number, since it is smaller than the sum of its proper divisors (29096422828).

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

21311425236 is a wasteful number, since it uses less digits than its factorization.

21311425236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24328191 (or 24328189 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

Adding to 21311425236 its reverse (63252411312), we get a palindrome (84563836548).

The spelling of 21311425236 in words is "twenty-one billion, three hundred eleven million, four hundred twenty-five thousand, two hundred thirty-six".