21616231105465 has 16 divisors (see below), whose sum is σ = 26231475542400. Its totient is φ = 17098327458432.

The previous prime is 21616231105439. The next prime is 21616231105477. The reversal of 21616231105465 is 56450113261612.

It is a cyclic number.

It is not a de Polignac number, because 21616231105465 - 2⁹ = 21616231104953 is a prime.

It is a super-2 number, since 2×21616231105465² (a number of 27 digits) contains 22 as substring.

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, 22145614 + ... + 23101096.

It is an arithmetic number, because the mean of its divisors is an integer number (1639467221400).

Almost surely, 2^{21616231105465} is an apocalyptic number.

It is an amenable number.

21616231105465 is a deficient number, since it is larger than the sum of its proper divisors (4615244436935).

21616231105465 is an equidigital number, since it uses as much as digits as its factorization.

21616231105465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006416.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 21616231105465 in words is "twenty-one trillion, six hundred sixteen billion, two hundred thirty-one million, one hundred five thousand, four hundred sixty-five".