21123534150 has 72 divisors (see below), whose sum is σ = 58136138424. Its totient is φ = 5495548800.

The previous prime is 21123534073. The next prime is 21123534181. The reversal of 21123534150 is 5143532112.

21123534150 is a `hidden beast` number, since 2 + 1 + 123 + 534 + 1 + 5 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 554004 + ... + 590903.

It is an arithmetic number, because the mean of its divisors is an integer number (807446367).

Almost surely, 2^21123534150 is an apocalyptic number.

21123534150 is an abundant number, since it is smaller than the sum of its proper divisors (37012604274).

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

21123534150 is a wasteful number, since it uses less digits than its factorization.

21123534150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144966 (or 1144958 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 21123534150 in words is "twenty-one billion, one hundred twenty-three million, five hundred thirty-four thousand, one hundred fifty".