3121562221 has 2 divisors, whose sum is σ = 3121562222. Its totient is φ = 3121562220.

The previous prime is 3121562209. The next prime is 3121562243. The reversal of 3121562221 is 1222651213.

3121562221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2859575625 + 261986596 = 53475^2 + 16186^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121562221 - 2¹¹ = 3121560173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121562201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560781110 + 1560781111.

It is an arithmetic number, because the mean of its divisors is an integer number (1560781111).

Almost surely, 2^3121562221 is an apocalyptic number.

It is an amenable number.

3121562221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121562221 is an equidigital number, since it uses as much as digits as its factorization.

3121562221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 3121562221 is about 55870.9425461930. The cubic root of 3121562221 is about 1461.4725589673.

The spelling of 3121562221 in words is "three billion, one hundred twenty-one million, five hundred sixty-two thousand, two hundred twenty-one".