21579367794 has 16 divisors (see below), whose sum is σ = 43749952032. Its totient is φ = 7094586528.

The previous prime is 21579367787. The next prime is 21579367801. The reversal of 21579367794 is 49776397512.

It is an interprime number because it is at equal distance from previous prime (21579367787) and next prime (21579367801).

It is a super-2 number, since 2×21579367794² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24633544 + ... + 24634419.

It is an arithmetic number, because the mean of its divisors is an integer number (2734372002).

Almost surely, 2^21579367794 is an apocalyptic number.

21579367794 is an abundant number, since it is smaller than the sum of its proper divisors (22170584238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21579367794 is a wasteful number, since it uses less digits than its factorization.

21579367794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49268041.

The product of its digits is 20003760, while the sum is 60.

The spelling of 21579367794 in words is "twenty-one billion, five hundred seventy-nine million, three hundred sixty-seven thousand, seven hundred ninety-four".