21672347756897 has 8 divisors (see below), whose sum is σ = 22039761096000. Its totient is φ = 21304937264944.

The previous prime is 21672347756893. The next prime is 21672347756987. The reversal of 21672347756897 is 79865774327612.

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 21672347756897 - 2² = 21672347756893 is a prime.

It is a super-2 number, since 2×21672347756897² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21672347756893) 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, 19432979 + ... + 20517927.

It is an arithmetic number, because the mean of its divisors is an integer number (2754970137000).

Almost surely, 2^{21672347756897} is an apocalyptic number.

It is an amenable number.

21672347756897 is a deficient number, since it is larger than the sum of its proper divisors (367413339103).

21672347756897 is a wasteful number, since it uses less digits than its factorization.

21672347756897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423575.

The product of its digits is 1493614080, while the sum is 74.

The spelling of 21672347756897 in words is "twenty-one trillion, six hundred seventy-two billion, three hundred forty-seven million, seven hundred fifty-six thousand, eight hundred ninety-seven".