21970363399 has 4 divisors (see below), whose sum is σ = 21971038536. Its totient is φ = 21969688264.

The previous prime is 21970363391. The next prime is 21970363411. The reversal of 21970363399 is 99336307912.

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 21970363399 - 2³ = 21970363391 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 (21970363391) 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, 286144 + ... + 354709.

It is an arithmetic number, because the mean of its divisors is an integer number (5492759634).

Almost surely, 2^21970363399 is an apocalyptic number.

21970363399 is a deficient number, since it is larger than the sum of its proper divisors (675137).

21970363399 is an equidigital number, since it uses as much as digits as its factorization.

21970363399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675136.

The product of its (nonzero) digits is 1653372, while the sum is 52.

The spelling of 21970363399 in words is "twenty-one billion, nine hundred seventy million, three hundred sixty-three thousand, three hundred ninety-nine".