21952813699 has 4 divisors (see below), whose sum is σ = 22179131464. Its totient is φ = 21726495936.

The previous prime is 21952813669. The next prime is 21952813709. The reversal of 21952813699 is 99631825912.

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 21952813699 - 2⁵ = 21952813667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21952813669) 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, 113158737 + ... + 113158930.

It is an arithmetic number, because the mean of its divisors is an integer number (5544782866).

Almost surely, 2^21952813699 is an apocalyptic number.

21952813699 is a deficient number, since it is larger than the sum of its proper divisors (226317765).

21952813699 is an equidigital number, since it uses as much as digits as its factorization.

21952813699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226317764.

The product of its digits is 2099520, while the sum is 55.

The spelling of 21952813699 in words is "twenty-one billion, nine hundred fifty-two million, eight hundred thirteen thousand, six hundred ninety-nine".