21034534506 has 32 divisors (see below), whose sum is σ = 42793228800. Its totient is φ = 6890880240.

The previous prime is 21034534463. The next prime is 21034534519. The reversal of 21034534506 is 60543543012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2551411 + ... + 2559641.

It is an arithmetic number, because the mean of its divisors is an integer number (1337288400).

Almost surely, 2^21034534506 is an apocalyptic number.

21034534506 is an abundant number, since it is smaller than the sum of its proper divisors (21758694294).

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

21034534506 is a wasteful number, since it uses less digits than its factorization.

21034534506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15514.

The product of its (nonzero) digits is 43200, while the sum is 33.

The spelling of 21034534506 in words is "twenty-one billion, thirty-four million, five hundred thirty-four thousand, five hundred six".