21122630879 has 16 divisors (see below), whose sum is σ = 24782499840. Its totient is φ = 17625263040.

The previous prime is 21122630873. The next prime is 21122630939. The reversal of 21122630879 is 97803622112.

It is not a de Polignac number, because 21122630879 - 2⁴ = 21122630863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122630873) 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, 53402 + ... + 212360.

It is an arithmetic number, because the mean of its divisors is an integer number (1548906240).

Almost surely, 2^21122630879 is an apocalyptic number.

21122630879 is a deficient number, since it is larger than the sum of its proper divisors (3659868961).

21122630879 is a wasteful number, since it uses less digits than its factorization.

21122630879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159470.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 21122630879 in words is "twenty-one billion, one hundred twenty-two million, six hundred thirty thousand, eight hundred seventy-nine".