21164014951 has 16 divisors (see below), whose sum is σ = 22149527040. Its totient is φ = 20196933120.

The previous prime is 21164014939. The next prime is 21164014973. The reversal of 21164014951 is 15941046112.

It is a cyclic number.

It is not a de Polignac number, because 21164014951 - 2¹⁷ = 21163883879 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 (21164414951) 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, 857455 + ... + 881791.

It is an arithmetic number, because the mean of its divisors is an integer number (1384345440).

Almost surely, 2^21164014951 is an apocalyptic number.

21164014951 is a deficient number, since it is larger than the sum of its proper divisors (985512089).

21164014951 is a wasteful number, since it uses less digits than its factorization.

21164014951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24714.

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 21164014951 in words is "twenty-one billion, one hundred sixty-four million, fourteen thousand, nine hundred fifty-one".