21012958967 has 16 divisors (see below), whose sum is σ = 28213204992. Its totient is φ = 15114215520.

The previous prime is 21012958961. The next prime is 21012958979. The reversal of 21012958967 is 76985921012.

It is a cyclic number.

It is not a de Polignac number, because 21012958967 - 2¹⁸ = 21012696823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012958961) 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, 10494983 + ... + 10496984.

It is an arithmetic number, because the mean of its divisors is an integer number (1763325312).

Almost surely, 2^21012958967 is an apocalyptic number.

21012958967 is a deficient number, since it is larger than the sum of its proper divisors (7200246025).

21012958967 is a wasteful number, since it uses less digits than its factorization.

21012958967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20991998.

The product of its (nonzero) digits is 544320, while the sum is 50.

It can be divided in two parts, 21012 and 958967, that added together give a palindrome (979979).

The spelling of 21012958967 in words is "twenty-one billion, twelve million, nine hundred fifty-eight thousand, nine hundred sixty-seven".