21167339979 has 16 divisors (see below), whose sum is σ = 28662729984. Its totient is φ = 13892340000.

The previous prime is 21167339957. The next prime is 21167339983. The reversal of 21167339979 is 97993376112.

It is not a de Polignac number, because 21167339979 - 2⁹ = 21167339467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21167359979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72729 + ... + 218229.

It is an arithmetic number, because the mean of its divisors is an integer number (1791420624).

Almost surely, 2^21167339979 is an apocalyptic number.

21167339979 is a deficient number, since it is larger than the sum of its proper divisors (7495390005).

21167339979 is a wasteful number, since it uses less digits than its factorization.

21167339979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146258.

The product of its digits is 3857868, while the sum is 57.

The spelling of 21167339979 in words is "twenty-one billion, one hundred sixty-seven million, three hundred thirty-nine thousand, nine hundred seventy-nine".