21562007051 has 16 divisors (see below), whose sum is σ = 23828544768. Its totient is φ = 19384012800.

The previous prime is 21562007023. The next prime is 21562007053. The reversal of 21562007051 is 15070026512.

It is not a de Polignac number, because 21562007051 - 2¹⁸ = 21561744907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21562007053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272486 + ... + 342596.

It is an arithmetic number, because the mean of its divisors is an integer number (1489284048).

Almost surely, 2^21562007051 is an apocalyptic number.

21562007051 is a deficient number, since it is larger than the sum of its proper divisors (2266537717).

21562007051 is a wasteful number, since it uses less digits than its factorization.

21562007051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70742.

The product of its (nonzero) digits is 4200, while the sum is 29.

The spelling of 21562007051 in words is "twenty-one billion, five hundred sixty-two million, seven thousand, fifty-one".