21241979979 has 32 divisors (see below), whose sum is σ = 31748544000. Its totient is φ = 12519648000.

The previous prime is 21241979953. The next prime is 21241979999. The reversal of 21241979979 is 97997914212.

It is not a de Polignac number, because 21241979979 - 2⁹ = 21241979467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21241979999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3658879 + ... + 3664679.

It is an arithmetic number, because the mean of its divisors is an integer number (992142000).

Almost surely, 2^21241979979 is an apocalyptic number.

21241979979 is a deficient number, since it is larger than the sum of its proper divisors (10506564021).

21241979979 is a wasteful number, since it uses less digits than its factorization.

21241979979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8851.

The product of its digits is 5143824, while the sum is 60.

The spelling of 21241979979 in words is "twenty-one billion, two hundred forty-one million, nine hundred seventy-nine thousand, nine hundred seventy-nine".