21242516634 has 24 divisors (see below), whose sum is σ = 48732832980. Its totient is φ = 6664318848.

The previous prime is 21242516623. The next prime is 21242516641. The reversal of 21242516634 is 43661524212.

21242516634 is a `hidden beast` number, since 2 + 1 + 2 + 4 + 2 + 5 + 16 + 634 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21214796409 + 27720225 = 145653^2 + 5265^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34709689 + ... + 34710300.

Almost surely, 2^21242516634 is an apocalyptic number.

21242516634 is an abundant number, since it is smaller than the sum of its proper divisors (27490316346).

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

21242516634 is a wasteful number, since it uses less digits than its factorization.

21242516634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69420014 (or 69420011 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The spelling of 21242516634 in words is "twenty-one billion, two hundred forty-two million, five hundred sixteen thousand, six hundred thirty-four".