1321121252 has 12 divisors (see below), whose sum is σ = 2522140656. Its totient is φ = 600509640.

The previous prime is 1321121239. The next prime is 1321121257. The reversal of 1321121252 is 2521211231.

It is a super-2 number, since 2×1321121252² = 3490722724972095008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321121257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15012698 + ... + 15012785.

It is an arithmetic number, because the mean of its divisors is an integer number (210178388).

Almost surely, 2^1321121252 is an apocalyptic number.

It is an amenable number.

1321121252 is a deficient number, since it is larger than the sum of its proper divisors (1201019404).

1321121252 is a wasteful number, since it uses less digits than its factorization.

1321121252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30025498 (or 30025496 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 1321121252 is about 36347.2316965130. The cubic root of 1321121252 is about 1097.2718210846.

Adding to 1321121252 its reverse (2521211231), we get a palindrome (3842332483).

The spelling of 1321121252 in words is "one billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred fifty-two".