21367125051 has 16 divisors (see below), whose sum is σ = 31292816640. Its totient is φ = 12908285280.

The previous prime is 21367125037. The next prime is 21367125061. The reversal of 21367125051 is 15052176312.

It is not a de Polignac number, because 21367125051 - 2²⁵ = 21333570619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21367125011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8147860 + ... + 8150481.

It is an arithmetic number, because the mean of its divisors is an integer number (1955801040).

Almost surely, 2^21367125051 is an apocalyptic number.

21367125051 is a deficient number, since it is larger than the sum of its proper divisors (9925691589).

21367125051 is a wasteful number, since it uses less digits than its factorization.

21367125051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16298386.

The product of its (nonzero) digits is 12600, while the sum is 33.

The spelling of 21367125051 in words is "twenty-one billion, three hundred sixty-seven million, one hundred twenty-five thousand, fifty-one".