21982632657 has 4 divisors (see below), whose sum is σ = 29310176880. Its totient is φ = 14655088436.

The previous prime is 21982632631. The next prime is 21982632689. The reversal of 21982632657 is 75623628912.

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 21982632657 - 2⁶ = 21982632593 is a prime.

It is a super-2 number, since 2×21982632657² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21982632457) 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, 3663772107 + ... + 3663772112.

It is an arithmetic number, because the mean of its divisors is an integer number (7327544220).

Almost surely, 2^21982632657 is an apocalyptic number.

It is an amenable number.

21982632657 is a deficient number, since it is larger than the sum of its proper divisors (7327544223).

21982632657 is an equidigital number, since it uses as much as digits as its factorization.

21982632657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7327544222.

The product of its digits is 2177280, while the sum is 51.

The spelling of 21982632657 in words is "twenty-one billion, nine hundred eighty-two million, six hundred thirty-two thousand, six hundred fifty-seven".