21151165167 has 24 divisors (see below), whose sum is σ = 34478393040. Its totient is φ = 12376855680.

The previous prime is 21151165163. The next prime is 21151165201. The reversal of 21151165167 is 76156115112.

21151165167 is a `hidden beast` number, since 21 + 1 + 5 + 116 + 516 + 7 = 666.

It is not a de Polignac number, because 21151165167 - 2² = 21151165163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151165163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3680718 + ... + 3686459.

It is an arithmetic number, because the mean of its divisors is an integer number (1436599710).

Almost surely, 2^21151165167 is an apocalyptic number.

21151165167 is a deficient number, since it is larger than the sum of its proper divisors (13327227873).

21151165167 is a wasteful number, since it uses less digits than its factorization.

21151165167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367223 (or 7367220 counting only the distinct ones).

The product of its digits is 12600, while the sum is 36.

The spelling of 21151165167 in words is "twenty-one billion, one hundred fifty-one million, one hundred sixty-five thousand, one hundred sixty-seven".