21335475779 has 8 divisors (see below), whose sum is σ = 22927676688. Its totient is φ = 19780738560.

The previous prime is 21335475773. The next prime is 21335475869. The reversal of 21335475779 is 97757453312.

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

It is a cyclic number.

It is not a de Polignac number, because 21335475779 - 2⁸ = 21335475523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21335475779.

It is not an unprimeable number, because it can be changed into a prime (21335475773) 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, 9364742 + ... + 9367019.

It is an arithmetic number, because the mean of its divisors is an integer number (2865959586).

Almost surely, 2^21335475779 is an apocalyptic number.

21335475779 is a deficient number, since it is larger than the sum of its proper divisors (1592200909).

21335475779 is a wasteful number, since it uses less digits than its factorization.

21335475779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18731845.

The product of its digits is 5556600, while the sum is 53.

The spelling of 21335475779 in words is "twenty-one billion, three hundred thirty-five million, four hundred seventy-five thousand, seven hundred seventy-nine".