21122572867 has 8 divisors (see below), whose sum is σ = 23048842752. Its totient is φ = 19197309000.

The previous prime is 21122572853. The next prime is 21122572871. The reversal of 21122572867 is 76827522112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122572867 - 2²⁷ = 20988355139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122572067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207259 + ... + 291892.

It is an arithmetic number, because the mean of its divisors is an integer number (2881105344).

Almost surely, 2^21122572867 is an apocalyptic number.

21122572867 is a deficient number, since it is larger than the sum of its proper divisors (1926269885).

21122572867 is a wasteful number, since it uses less digits than its factorization.

21122572867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503009.

The product of its digits is 188160, while the sum is 43.

The spelling of 21122572867 in words is "twenty-one billion, one hundred twenty-two million, five hundred seventy-two thousand, eight hundred sixty-seven".