21975844944491 has 8 divisors (see below), whose sum is σ = 22147033986000. Its totient is φ = 21804707941120.

The previous prime is 21975844944481. The next prime is 21975844944511. The reversal of 21975844944491 is 19444944857912.

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 21975844944491 - 2³⁴ = 21958665075307 is a prime.

It is a super-2 number, since 2×21975844944491² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21975844944401) 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, 12161426 + ... + 13851063.

It is an arithmetic number, because the mean of its divisors is an integer number (2768379248250).

Almost surely, 2^{21975844944491} is an apocalyptic number.

21975844944491 is a deficient number, since it is larger than the sum of its proper divisors (171189041509).

21975844944491 is a wasteful number, since it uses less digits than its factorization.

21975844944491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26019069.

The product of its digits is 418037760, while the sum is 71.

The spelling of 21975844944491 in words is "twenty-one trillion, nine hundred seventy-five billion, eight hundred forty-four million, nine hundred forty-four thousand, four hundred ninety-one".