1225316135221 has 4 divisors (see below), whose sum is σ = 1225318362444. Its totient is φ = 1225313908000.

The previous prime is 1225316135203. The next prime is 1225316135273.

1225316135221 is nontrivially palindromic in base 10.

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 295077104100 + 930239031121 = 543210^2 + 964489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225316135221 - 2²⁵ = 1225282580789 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 (1225316135821) 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, 374241 + ... + 1609561.

It is an arithmetic number, because the mean of its divisors is an integer number (306329590611).

Almost surely, 2^{1225316135221} is an apocalyptic number.

It is an amenable number.

1225316135221 is a deficient number, since it is larger than the sum of its proper divisors (2227223).

1225316135221 is an equidigital number, since it uses as much as digits as its factorization.

1225316135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227222.

The product of its digits is 21600, while the sum is 34.

The spelling of 1225316135221 in words is "one trillion, two hundred twenty-five billion, three hundred sixteen million, one hundred thirty-five thousand, two hundred twenty-one".