21579053315 has 4 divisors (see below), whose sum is σ = 25894863984. Its totient is φ = 17263242648.

The previous prime is 21579053303. The next prime is 21579053317. The reversal of 21579053315 is 51335097512.

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

It is a cyclic number.

It is not a de Polignac number, because 21579053315 - 2³² = 17284086019 is a prime.

It is a super-2 number, since 2×21579053315² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21579053317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2157905327 + ... + 2157905336.

It is an arithmetic number, because the mean of its divisors is an integer number (6473715996).

Almost surely, 2^21579053315 is an apocalyptic number.

21579053315 is a deficient number, since it is larger than the sum of its proper divisors (4315810669).

21579053315 is an equidigital number, since it uses as much as digits as its factorization.

21579053315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4315810668.

The product of its (nonzero) digits is 141750, while the sum is 41.

The spelling of 21579053315 in words is "twenty-one billion, five hundred seventy-nine million, fifty-three thousand, three hundred fifteen".