1217221117615 has 4 divisors (see below), whose sum is σ = 1460665341144. Its totient is φ = 973776894088.

The previous prime is 1217221117579. The next prime is 1217221117627. The reversal of 1217221117615 is 5167111227121.

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 1217221117615 - 2²⁵ = 1217187563183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121722111757 + ... + 121722111766.

It is an arithmetic number, because the mean of its divisors is an integer number (365166335286).

Almost surely, 2^{1217221117615} is an apocalyptic number.

1217221117615 is a deficient number, since it is larger than the sum of its proper divisors (243444223529).

1217221117615 is an equidigital number, since it uses as much as digits as its factorization.

1217221117615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243444223528.

The product of its digits is 11760, while the sum is 37.

The spelling of 1217221117615 in words is "one trillion, two hundred seventeen billion, two hundred twenty-one million, one hundred seventeen thousand, six hundred fifteen".