1221310315255 has 8 divisors (see below), whose sum is σ = 1471274996112. Its totient is φ = 973246507008.

The previous prime is 1221310315241. The next prime is 1221310315261. The reversal of 1221310315255 is 5525130131221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221310315255 - 2²⁷ = 1221176097527 is a prime.

It is a super-2 number, since 2×1221310315255² (a number of 25 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 475216737 + ... + 475219306.

It is an arithmetic number, because the mean of its divisors is an integer number (183909374514).

Almost surely, 2^{1221310315255} is an apocalyptic number.

1221310315255 is a deficient number, since it is larger than the sum of its proper divisors (249964680857).

1221310315255 is an equidigital number, since it uses as much as digits as its factorization.

1221310315255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950436305.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 1221310315255 its reverse (5525130131221), we get a palindrome (6746440446476).

The spelling of 1221310315255 in words is "one trillion, two hundred twenty-one billion, three hundred ten million, three hundred fifteen thousand, two hundred fifty-five".