21366736875 has 400 divisors, whose sum is σ = 48091180896. Its totient is φ = 9331200000.

The previous prime is 21366736849. The next prime is 21366736877. The reversal of 21366736875 is 57863766312.

21366736875 is a `hidden beast` number, since 213 + 6 + 67 + 368 + 7 + 5 = 666.

It is not a de Polignac number, because 21366736875 - 2⁸ = 21366736619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366736877) by changing a digit.

It is a polite number, since it can be written in 399 ways as a sum of consecutive naturals, for example, 350274345 + ... + 350274405.

Almost surely, 2^21366736875 is an apocalyptic number.

21366736875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21366736875 is an abundant number, since it is smaller than the sum of its proper divisors (26724444021).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21366736875 is a wasteful number, since it uses less digits than its factorization.

21366736875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 134 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 21366736875 in words is "twenty-one billion, three hundred sixty-six million, seven hundred thirty-six thousand, eight hundred seventy-five".