21113179021 has 8 divisors (see below), whose sum is σ = 23775545088. Its totient is φ = 18574644000.

The previous prime is 21113179013. The next prime is 21113179027. The reversal of 21113179021 is 12097131112.

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

It is not a de Polignac number, because 21113179021 - 2³ = 21113179013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113179027) 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, 30957400 + ... + 30958081.

It is an arithmetic number, because the mean of its divisors is an integer number (2971943136).

Almost surely, 2^21113179021 is an apocalyptic number.

It is an amenable number.

21113179021 is a deficient number, since it is larger than the sum of its proper divisors (2662366067).

21113179021 is a wasteful number, since it uses less digits than its factorization.

21113179021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61915523.

The product of its (nonzero) digits is 756, while the sum is 28.

The spelling of 21113179021 in words is "twenty-one billion, one hundred thirteen million, one hundred seventy-nine thousand, twenty-one".