21367272717 has 128 divisors (see below), whose sum is σ = 38137651200. Its totient is φ = 11570936832.

The previous prime is 21367272653. The next prime is 21367272733. The reversal of 21367272717 is 71727276312.

21367272717 is a `hidden beast` number, since 2 + 1 + 367 + 272 + 7 + 17 = 666.

It is not a de Polignac number, because 21367272717 - 2⁶ = 21367272653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367272737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 48672384 + ... + 48672822.

It is an arithmetic number, because the mean of its divisors is an integer number (297950400).

Almost surely, 2^21367272717 is an apocalyptic number.

21367272717 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21367272717 is a deficient number, since it is larger than the sum of its proper divisors (16770378483).

21367272717 is a wasteful number, since it uses less digits than its factorization.

21367272717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664 (or 658 counting only the distinct ones).

The product of its digits is 345744, while the sum is 45.

The spelling of 21367272717 in words is "twenty-one billion, three hundred sixty-seven million, two hundred seventy-two thousand, seven hundred seventeen".