21072216213 has 24 divisors (see below), whose sum is σ = 31708535040. Its totient is φ = 13473195840.

The previous prime is 21072216203. The next prime is 21072216229. The reversal of 21072216213 is 31261227012.

21072216213 is a `hidden beast` number, since 2 + 10 + 7 + 2 + 21 + 621 + 3 = 666.

It is not a de Polignac number, because 21072216213 - 2⁵ = 21072216181 is a prime.

It is a super-2 number, since 2×21072216213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21072216203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 462181 + ... + 505722.

It is an arithmetic number, because the mean of its divisors is an integer number (1321188960).

Almost surely, 2^21072216213 is an apocalyptic number.

It is an amenable number.

21072216213 is a deficient number, since it is larger than the sum of its proper divisors (10636318827).

21072216213 is a wasteful number, since it uses less digits than its factorization.

21072216213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968009 (or 968006 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The spelling of 21072216213 in words is "twenty-one billion, seventy-two million, two hundred sixteen thousand, two hundred thirteen".