21650939597 has 8 divisors (see below), whose sum is σ = 24765437952. Its totient is φ = 18541818000.

The previous prime is 21650939587. The next prime is 21650939599. The reversal of 21650939597 is 79593905612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21650939597 - 2¹⁸ = 21650677453 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 (21650939599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1335554 + ... + 1351667.

It is an arithmetic number, because the mean of its divisors is an integer number (3095679744).

Almost surely, 2^21650939597 is an apocalyptic number.

It is an amenable number.

21650939597 is a deficient number, since it is larger than the sum of its proper divisors (3114498355).

21650939597 is a wasteful number, since it uses less digits than its factorization.

21650939597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688379.

The product of its (nonzero) digits is 4592700, while the sum is 56.

The spelling of 21650939597 in words is "twenty-one billion, six hundred fifty million, nine hundred thirty-nine thousand, five hundred ninety-seven".