21552236423 has 16 divisors (see below), whose sum is σ = 22969712640. Its totient is φ = 20187921600.

The previous prime is 21552236399. The next prime is 21552236429. The reversal of 21552236423 is 32463225512.

It is a cyclic number.

It is not a de Polignac number, because 21552236423 - 2¹² = 21552232327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552236429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94658 + ... + 228176.

It is an arithmetic number, because the mean of its divisors is an integer number (1435607040).

Almost surely, 2^21552236423 is an apocalyptic number.

21552236423 is a deficient number, since it is larger than the sum of its proper divisors (1417476217).

21552236423 is a wasteful number, since it uses less digits than its factorization.

21552236423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133718.

The product of its digits is 86400, while the sum is 35.

The spelling of 21552236423 in words is "twenty-one billion, five hundred fifty-two million, two hundred thirty-six thousand, four hundred twenty-three".