21552622699 has 4 divisors (see below), whose sum is σ = 21812292936. Its totient is φ = 21292952464.

The previous prime is 21552622687. The next prime is 21552622703. The reversal of 21552622699 is 99622625512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21552622699 - 2⁷ = 21552622571 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21552622099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129834994 + ... + 129835159.

It is an arithmetic number, because the mean of its divisors is an integer number (5453073234).

Almost surely, 2^21552622699 is an apocalyptic number.

21552622699 is a deficient number, since it is larger than the sum of its proper divisors (259670237).

21552622699 is an equidigital number, since it uses as much as digits as its factorization.

21552622699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259670236.

The product of its digits is 1166400, while the sum is 49.

It can be divided in two parts, 2155262 and 2699, that added together give a square (2157961 = 1469²).

The spelling of 21552622699 in words is "twenty-one billion, five hundred fifty-two million, six hundred twenty-two thousand, six hundred ninety-nine".