21393882597 has 4 divisors (see below), whose sum is σ = 28525176800. Its totient is φ = 14262588396.

The previous prime is 21393882593. The next prime is 21393882613. The reversal of 21393882597 is 79528839312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21393882597 - 2² = 21393882593 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 (21393882593) 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, 3565647097 + ... + 3565647102.

It is an arithmetic number, because the mean of its divisors is an integer number (7131294200).

Almost surely, 2^21393882597 is an apocalyptic number.

It is an amenable number.

21393882597 is a deficient number, since it is larger than the sum of its proper divisors (7131294203).

21393882597 is an equidigital number, since it uses as much as digits as its factorization.

21393882597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7131294202.

The product of its digits is 6531840, while the sum is 57.

The spelling of 21393882597 in words is "twenty-one billion, three hundred ninety-three million, eight hundred eighty-two thousand, five hundred ninety-seven".