21552657343 has 32 divisors (see below), whose sum is σ = 25302528000. Its totient is φ = 17977780224.

The previous prime is 21552657331. The next prime is 21552657377. The reversal of 21552657343 is 34375625512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21552657343 - 2²⁹ = 21015786431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21552657343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552657943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35506546 + ... + 35507152.

It is an arithmetic number, because the mean of its divisors is an integer number (790704000).

Almost surely, 2^21552657343 is an apocalyptic number.

21552657343 is a deficient number, since it is larger than the sum of its proper divisors (3749870657).

21552657343 is a wasteful number, since it uses less digits than its factorization.

21552657343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399.

The product of its digits is 756000, while the sum is 43.

The spelling of 21552657343 in words is "twenty-one billion, five hundred fifty-two million, six hundred fifty-seven thousand, three hundred forty-three".