21112500534 has 16 divisors (see below), whose sum is σ = 42229287360. Its totient is φ = 7036785800.

The previous prime is 21112500529. The next prime is 21112500571. The reversal of 21112500534 is 43500521112.

It is a happy number.

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, 112692 + ... + 234359.

It is an arithmetic number, because the mean of its divisors is an integer number (2639330460).

Almost surely, 2^21112500534 is an apocalyptic number.

21112500534 is an abundant number, since it is smaller than the sum of its proper divisors (21116786826).

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

21112500534 is a wasteful number, since it uses less digits than its factorization.

21112500534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357195.

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 21112500534 in words is "twenty-one billion, one hundred twelve million, five hundred thousand, five hundred thirty-four".