21756136363 has 8 divisors (see below), whose sum is σ = 23430909600. Its totient is φ = 20081538048.

The previous prime is 21756136331. The next prime is 21756136397. The reversal of 21756136363 is 36363165712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21756136363 - 2⁵ = 21756136331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21756131363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338178 + ... + 397336.

It is an arithmetic number, because the mean of its divisors is an integer number (2928863700).

Almost surely, 2^21756136363 is an apocalyptic number.

21756136363 is a deficient number, since it is larger than the sum of its proper divisors (1674773237).

21756136363 is a wasteful number, since it uses less digits than its factorization.

21756136363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87461.

The product of its digits is 408240, while the sum is 43.

The spelling of 21756136363 in words is "twenty-one billion, seven hundred fifty-six million, one hundred thirty-six thousand, three hundred sixty-three".