3121221253 has 2 divisors, whose sum is σ = 3121221254. Its totient is φ = 3121221252.

The previous prime is 3121221241. The next prime is 3121221277. The reversal of 3121221253 is 3521221213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2503301089 + 617920164 = 50033^2 + 24858^2 .

It is an emirp because it is prime and its reverse (3521221213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3121221253 - 2⁹ = 3121220741 is a prime.

It is a super-2 number, since 2×3121221253² = 19484044220357780018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121221553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560610626 + 1560610627.

It is an arithmetic number, because the mean of its divisors is an integer number (1560610627).

Almost surely, 2^3121221253 is an apocalyptic number.

It is an amenable number.

3121221253 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121221253 is an equidigital number, since it uses as much as digits as its factorization.

3121221253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 3121221253 is about 55867.8910734959. The cubic root of 3121221253 is about 1461.4193448515.

Adding to 3121221253 its reverse (3521221213), we get a palindrome (6642442466).

The spelling of 3121221253 in words is "three billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred fifty-three".