21131434396 has 6 divisors (see below), whose sum is σ = 36980010200. Its totient is φ = 10565717196.

The previous prime is 21131434393. The next prime is 21131434417. The reversal of 21131434396 is 69343413112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131434393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2641429296 + ... + 2641429303.

Almost surely, 2^21131434396 is an apocalyptic number.

It is an amenable number.

21131434396 is a deficient number, since it is larger than the sum of its proper divisors (15848575804).

21131434396 is a wasteful number, since it uses less digits than its factorization.

21131434396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5282858603 (or 5282858601 counting only the distinct ones).

The product of its digits is 46656, while the sum is 37.

The spelling of 21131434396 in words is "twenty-one billion, one hundred thirty-one million, four hundred thirty-four thousand, three hundred ninety-six".