21465531561115 has 16 divisors (see below), whose sum is σ = 26275061138688. Its totient is φ = 16828893966976.

The previous prime is 21465531561083. The next prime is 21465531561127. The reversal of 21465531561115 is 51116513556412.

It is a cyclic number.

It is not a de Polignac number, because 21465531561115 - 2⁵ = 21465531561083 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46701784 + ... + 47159173.

It is an arithmetic number, because the mean of its divisors is an integer number (1642191321168).

Almost surely, 2^{21465531561115} is an apocalyptic number.

21465531561115 is a deficient number, since it is larger than the sum of its proper divisors (4809529577573).

21465531561115 is an equidigital number, since it uses as much as digits as its factorization.

21465531561115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93861878.

The product of its digits is 540000, while the sum is 46.

The spelling of 21465531561115 in words is "twenty-one trillion, four hundred sixty-five billion, five hundred thirty-one million, five hundred sixty-one thousand, one hundred fifteen".