21520617737327 has 8 divisors (see below), whose sum is σ = 22799316345696. Its totient is φ = 20243339119872.

The previous prime is 21520617737321. The next prime is 21520617737387. The reversal of 21520617737327 is 72373771602512.

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

It is a cyclic number.

It is not a de Polignac number, because 21520617737327 - 2⁸ = 21520617737071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21520617737321) 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, 354966518 + ... + 355027139.

It is an arithmetic number, because the mean of its divisors is an integer number (2849914543212).

Almost surely, 2^{21520617737327} is an apocalyptic number.

21520617737327 is a deficient number, since it is larger than the sum of its proper divisors (1278698608369).

21520617737327 is a wasteful number, since it uses less digits than its factorization.

21520617737327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709995457.

The product of its (nonzero) digits is 5186160, while the sum is 53.

The spelling of 21520617737327 in words is "twenty-one trillion, five hundred twenty billion, six hundred seventeen million, seven hundred thirty-seven thousand, three hundred twenty-seven".