21879073951 has 16 divisors (see below), whose sum is σ = 25711911424. Its totient is φ = 18224292384.

The previous prime is 21879073921. The next prime is 21879074023. The reversal of 21879073951 is 15937097812.

It is a cyclic number.

It is not a de Polignac number, because 21879073951 - 2⁵ = 21879073919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21879073921) 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, 161836 + ... + 264478.

It is an arithmetic number, because the mean of its divisors is an integer number (1606994464).

Almost surely, 2^21879073951 is an apocalyptic number.

21879073951 is a deficient number, since it is larger than the sum of its proper divisors (3832837473).

21879073951 is a wasteful number, since it uses less digits than its factorization.

21879073951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103510.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 21879073951 in words is "twenty-one billion, eight hundred seventy-nine million, seventy-three thousand, nine hundred fifty-one".