21917959082244 has 81 divisors (see below), whose sum is σ = 55669201265223. Its totient is φ = 7271145432144.

The previous prime is 21917959082237. The next prime is 21917959082249. The reversal of 21917959082244 is 44228095971912.

The square root of 21917959082244 is 4681662.

It is a perfect power (a square), and thus also a powerful number.

21917959082244 is a `hidden beast` number, since 2 + 1 + 9 + 17 + 9 + 590 + 8 + 2 + 24 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (21917959082249) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6264062007 + ... + 6264065505.

Almost surely, 2^{21917959082244} is an apocalyptic number.

21917959082244 is the 4681662-nd square number.

It is an amenable number.

21917959082244 is an abundant number, since it is smaller than the sum of its proper divisors (33751242182979).

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

21917959082244 is an frugal number, since it uses more digits than its factorization.

21917959082244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7454 (or 3727 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 21917959082244 in words is "twenty-one trillion, nine hundred seventeen billion, nine hundred fifty-nine million, eighty-two thousand, two hundred forty-four".