21552958641 has 8 divisors (see below), whose sum is σ = 29279491200. Its totient is φ = 14097532592.

The previous prime is 21552958631. The next prime is 21552958733. The reversal of 21552958641 is 14685925512.

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 21552958641 - 2¹⁰ = 21552957617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21552958631) 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, 67776441 + ... + 67776758.

It is an arithmetic number, because the mean of its divisors is an integer number (3659936400).

Almost surely, 2^21552958641 is an apocalyptic number.

It is an amenable number.

21552958641 is a deficient number, since it is larger than the sum of its proper divisors (7726532559).

21552958641 is a wasteful number, since it uses less digits than its factorization.

21552958641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135553255.

The product of its digits is 864000, while the sum is 48.

It can be divided in two parts, 215529 and 58641, that added together give a triangular number (274170 = T₇₄₀).

The spelling of 21552958641 in words is "twenty-one billion, five hundred fifty-two million, nine hundred fifty-eight thousand, six hundred forty-one".