1110312131221 has 4 divisors (see below), whose sum is σ = 1116065044012. Its totient is φ = 1104559218432.

The previous prime is 1110312131197. The next prime is 1110312131231. The reversal of 1110312131221 is 1221312130111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128203383025 + 982108748196 = 358055^2 + 991014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1110312131221 - 2¹⁵ = 1110312098453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1110312131231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2876456106 + ... + 2876456491.

It is an arithmetic number, because the mean of its divisors is an integer number (279016261003).

Almost surely, 2^{1110312131221} is an apocalyptic number.

It is an amenable number.

1110312131221 is a deficient number, since it is larger than the sum of its proper divisors (5752912791).

1110312131221 is an equidigital number, since it uses as much as digits as its factorization.

1110312131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5752912790.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1110312131221 its reverse (1221312130111), we get a palindrome (2331624261332).

The spelling of 1110312131221 in words is "one trillion, one hundred ten billion, three hundred twelve million, one hundred thirty-one thousand, two hundred twenty-one".