21946739583 has 32 divisors (see below), whose sum is σ = 31349203200. Its totient is φ = 13615430400.

The previous prime is 21946739537. The next prime is 21946739623. The reversal of 21946739583 is 38593764912.

It is not a de Polignac number, because 21946739583 - 2⁸ = 21946739327 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21946739183) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7669573 + ... + 7672433.

It is an arithmetic number, because the mean of its divisors is an integer number (979662600).

Almost surely, 2^21946739583 is an apocalyptic number.

21946739583 is a deficient number, since it is larger than the sum of its proper divisors (9402463617).

21946739583 is a wasteful number, since it uses less digits than its factorization.

21946739583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5223.

The product of its digits is 9797760, while the sum is 57.

The spelling of 21946739583 in words is "twenty-one billion, nine hundred forty-six million, seven hundred thirty-nine thousand, five hundred eighty-three".