21500534134 has 16 divisors (see below), whose sum is σ = 34178925888. Its totient is φ = 10108707712.

The previous prime is 21500533997. The next prime is 21500534161. The reversal of 21500534134 is 43143500512.

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, 249157 + ... + 324160.

It is an arithmetic number, because the mean of its divisors is an integer number (2136182868).

Almost surely, 2^21500534134 is an apocalyptic number.

21500534134 is a deficient number, since it is larger than the sum of its proper divisors (12678391754).

21500534134 is a wasteful number, since it uses less digits than its factorization.

21500534134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574439.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21500534134 in words is "twenty-one billion, five hundred million, five hundred thirty-four thousand, one hundred thirty-four".