21515035350323 has 4 divisors (see below), whose sum is σ = 21604309356168. Its totient is φ = 21425761344480.

The previous prime is 21515035350311. The next prime is 21515035350379. The reversal of 21515035350323 is 32305353051512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21515035350323 is a prime.

It is a super-2 number, since 2×21515035350323² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21515035350383) 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 3 ways as a sum of consecutive naturals, for example, 44637002561 + ... + 44637003042.

It is an arithmetic number, because the mean of its divisors is an integer number (5401077339042).

Almost surely, 2^{21515035350323} is an apocalyptic number.

21515035350323 is a deficient number, since it is larger than the sum of its proper divisors (89274005845).

21515035350323 is an equidigital number, since it uses as much as digits as its factorization.

21515035350323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89274005844.

The product of its (nonzero) digits is 202500, while the sum is 38.

The spelling of 21515035350323 in words is "twenty-one trillion, five hundred fifteen billion, thirty-five million, three hundred fifty thousand, three hundred twenty-three".