21552344553531 has 8 divisors (see below), whose sum is σ = 31348864805184. Its totient is φ = 13062027002120.

The previous prime is 21552344553499. The next prime is 21552344553541. The reversal of 21552344553531 is 13535544325512.

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 21552344553531 - 2⁵ = 21552344553499 is a prime.

It is a super-2 number, since 2×21552344553531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21552344553541) 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, 326550675021 + ... + 326550675086.

It is an arithmetic number, because the mean of its divisors is an integer number (3918608100648).

Almost surely, 2^{21552344553531} is an apocalyptic number.

21552344553531 is a deficient number, since it is larger than the sum of its proper divisors (9796520251653).

21552344553531 is a wasteful number, since it uses less digits than its factorization.

21552344553531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653101350121.

The product of its digits is 5400000, while the sum is 48.

The spelling of 21552344553531 in words is "twenty-one trillion, five hundred fifty-two billion, three hundred forty-four million, five hundred fifty-three thousand, five hundred thirty-one".