21254235132 has 24 divisors (see below), whose sum is σ = 53408078416. Its totient is φ = 6539764608.

The previous prime is 21254235103. The next prime is 21254235151. The reversal of 21254235132 is 23153245212.

It is a super-2 number, since 2×21254235132² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21254235132.

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, 68122393 + ... + 68122704.

Almost surely, 2^21254235132 is an apocalyptic number.

It is an amenable number.

21254235132 is an abundant number, since it is smaller than the sum of its proper divisors (32153843284).

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

21254235132 is a wasteful number, since it uses less digits than its factorization.

21254235132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136245117 (or 136245115 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

The spelling of 21254235132 in words is "twenty-one billion, two hundred fifty-four million, two hundred thirty-five thousand, one hundred thirty-two".