21613015342615 has 4 divisors (see below), whose sum is σ = 25935618411144. Its totient is φ = 17290412274088.

The previous prime is 21613015342609. The next prime is 21613015342619. The reversal of 21613015342615 is 51624351031612.

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-21613015342615 is a prime.

It is a super-2 number, since 2×21613015342615² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613015342619) 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, 2161301534257 + ... + 2161301534266.

It is an arithmetic number, because the mean of its divisors is an integer number (6483904602786).

Almost surely, 2^{21613015342615} is an apocalyptic number.

21613015342615 is a deficient number, since it is larger than the sum of its proper divisors (4322603068529).

21613015342615 is an equidigital number, since it uses as much as digits as its factorization.

21613015342615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4322603068528.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 21613015342615 in words is "twenty-one trillion, six hundred thirteen billion, fifteen million, three hundred forty-two thousand, six hundred fifteen".