21983044581 has 48 divisors (see below), whose sum is σ = 34090632576. Its totient is φ = 13619155968.

The previous prime is 21983044561. The next prime is 21983044613. The reversal of 21983044581 is 18544038912.

21983044581 is a `hidden beast` number, since 2 + 198 + 3 + 0 + 4 + 458 + 1 = 666.

It is not a de Polignac number, because 21983044581 - 2¹³ = 21983036389 is a prime.

It is a super-2 number, since 2×21983044581² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983044541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1001581 + ... + 1023293.

It is an arithmetic number, because the mean of its divisors is an integer number (710221512).

Almost surely, 2^21983044581 is an apocalyptic number.

It is an amenable number.

21983044581 is a deficient number, since it is larger than the sum of its proper divisors (12107587995).

21983044581 is a wasteful number, since it uses less digits than its factorization.

21983044581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21882 (or 21879 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 21983044581 in words is "twenty-one billion, nine hundred eighty-three million, forty-four thousand, five hundred eighty-one".