21802090479 has 8 divisors (see below), whose sum is σ = 31305565872. Its totient is φ = 13416671040.

The previous prime is 21802090477. The next prime is 21802090483. The reversal of 21802090479 is 97409020812.

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

It is not a de Polignac number, because 21802090479 - 2¹ = 21802090477 is a prime.

It is a super-2 number, since 2×21802090479² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21802090479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21802090477) 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, 279513942 + ... + 279514019.

It is an arithmetic number, because the mean of its divisors is an integer number (3913195734).

Almost surely, 2^21802090479 is an apocalyptic number.

21802090479 is a deficient number, since it is larger than the sum of its proper divisors (9503475393).

21802090479 is a wasteful number, since it uses less digits than its factorization.

21802090479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559027977.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 21802090479 in words is "twenty-one billion, eight hundred two million, ninety thousand, four hundred seventy-nine".