21682848997 has 4 divisors (see below), whose sum is σ = 21957315520. Its totient is φ = 21408382476.

The previous prime is 21682848989. The next prime is 21682849007. The reversal of 21682848997 is 79984828612.

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 a cyclic number.

It is not a de Polignac number, because 21682848997 - 2³ = 21682848989 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 (21682848907) 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, 137233143 + ... + 137233300.

It is an arithmetic number, because the mean of its divisors is an integer number (5489328880).

Almost surely, 2^21682848997 is an apocalyptic number.

It is an amenable number.

21682848997 is a deficient number, since it is larger than the sum of its proper divisors (274466523).

21682848997 is an equidigital number, since it uses as much as digits as its factorization.

21682848997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274466522.

The product of its digits is 27869184, while the sum is 64.

The spelling of 21682848997 in words is "twenty-one billion, six hundred eighty-two million, eight hundred forty-eight thousand, nine hundred ninety-seven".