1221112315455 has 16 divisors (see below), whose sum is σ = 1975732287840. Its totient is φ = 643942373888.

The previous prime is 1221112315403. The next prime is 1221112315457. The reversal of 1221112315455 is 5545132111221.

It is a cyclic number.

It is not a de Polignac number, because 1221112315455 - 2³¹ = 1218964831807 is a prime.

It is a super-2 number, since 2×1221112315455² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221112315457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457344102 + ... + 457346771.

It is an arithmetic number, because the mean of its divisors is an integer number (123483267990).

Almost surely, 2^{1221112315455} is an apocalyptic number.

1221112315455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221112315455 is a deficient number, since it is larger than the sum of its proper divisors (754619972385).

1221112315455 is an equidigital number, since it uses as much as digits as its factorization.

1221112315455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914690970.

The product of its digits is 12000, while the sum is 33.

Adding to 1221112315455 its reverse (5545132111221), we get a palindrome (6766244426676).

The spelling of 1221112315455 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, three hundred fifteen thousand, four hundred fifty-five".