21335197715672 has 128 divisors (see below), whose sum is σ = 41780551680000. Its totient is φ = 10205973043200.

The previous prime is 21335197715669. The next prime is 21335197715677. The reversal of 21335197715672 is 27651779153312.

It is a super-3 number, since 3×21335197715672³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335197715677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5189780897 + ... + 5189785007.

It is an arithmetic number, because the mean of its divisors is an integer number (326410560000).

Almost surely, 2^{21335197715672} is an apocalyptic number.

It is an amenable number.

21335197715672 is a deficient number, since it is larger than the sum of its proper divisors (20445353964328).

21335197715672 is a wasteful number, since it uses less digits than its factorization.

21335197715672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5665 (or 5661 counting only the distinct ones).

The product of its digits is 16669800, while the sum is 59.

The spelling of 21335197715672 in words is "twenty-one trillion, three hundred thirty-five billion, one hundred ninety-seven million, seven hundred fifteen thousand, six hundred seventy-two".