21813466444 has 24 divisors (see below), whose sum is σ = 47593018368. Its totient is φ = 8498753040.

The previous prime is 21813466403. The next prime is 21813466483. The reversal of 21813466444 is 44466431812.

It is a self number, because there is not a number n which added to its sum of digits gives 21813466444.

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, 35411164 + ... + 35411779.

It is an arithmetic number, because the mean of its divisors is an integer number (1983042432).

Almost surely, 2^21813466444 is an apocalyptic number.

It is an amenable number.

21813466444 is an abundant number, since it is smaller than the sum of its proper divisors (25779551924).

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

21813466444 is a wasteful number, since it uses less digits than its factorization.

21813466444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70822965 (or 70822963 counting only the distinct ones).

The product of its digits is 442368, while the sum is 43.

The spelling of 21813466444 in words is "twenty-one billion, eight hundred thirteen million, four hundred sixty-six thousand, four hundred forty-four".