21134131372 has 12 divisors (see below), whose sum is σ = 37094479240. Its totient is φ = 10535708736.

The previous prime is 21134131351. The next prime is 21134131373. The reversal of 21134131372 is 27313143112.

It is a self number, because there is not a number n which added to its sum of digits gives 21134131372.

It is not an unprimeable number, because it can be changed into a prime (21134131373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7837722 + ... + 7840417.

Almost surely, 2^21134131372 is an apocalyptic number.

It is an amenable number.

21134131372 is a deficient number, since it is larger than the sum of its proper divisors (15960347868).

21134131372 is a wasteful number, since it uses less digits than its factorization.

21134131372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15678480 (or 15678478 counting only the distinct ones).

The product of its digits is 3024, while the sum is 28.

Adding to 21134131372 its reverse (27313143112), we get a palindrome (48447274484).

The spelling of 21134131372 in words is "twenty-one billion, one hundred thirty-four million, one hundred thirty-one thousand, three hundred seventy-two".