21397791676682 has 16 divisors (see below), whose sum is σ = 32643661223520. Its totient is φ = 10516604180688.

The previous prime is 21397791676669. The next prime is 21397791676693. The reversal of 21397791676682 is 28667619779312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6921233 + ... + 9523604.

It is an arithmetic number, because the mean of its divisors is an integer number (2040228826470).

Almost surely, 2^{21397791676682} is an apocalyptic number.

21397791676682 is a deficient number, since it is larger than the sum of its proper divisors (11245869546838).

21397791676682 is a wasteful number, since it uses less digits than its factorization.

21397791676682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16455925.

The product of its digits is 576108288, while the sum is 74.

The spelling of 21397791676682 in words is "twenty-one trillion, three hundred ninety-seven billion, seven hundred ninety-one million, six hundred seventy-six thousand, six hundred eighty-two".