21865602241 has 8 divisors (see below), whose sum is σ = 24990608384. Its totient is φ = 18740933280.

The previous prime is 21865602233. The next prime is 21865602299. The reversal of 21865602241 is 14220656812.

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 21865602241 - 2³ = 21865602233 is a prime.

It is a super-2 number, since 2×21865602241² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21865602241.

It is not an unprimeable number, because it can be changed into a prime (21865602221) 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, 74656 + ... + 222046.

It is an arithmetic number, because the mean of its divisors is an integer number (3123826048).

Almost surely, 2^21865602241 is an apocalyptic number.

It is an amenable number.

21865602241 is a deficient number, since it is larger than the sum of its proper divisors (3125006143).

21865602241 is a wasteful number, since it uses less digits than its factorization.

21865602241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168591.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 21865602241 in words is "twenty-one billion, eight hundred sixty-five million, six hundred two thousand, two hundred forty-one".