2121221941 has 2 divisors, whose sum is σ = 2121221942. Its totient is φ = 2121221940.

The previous prime is 2121221933. The next prime is 2121222011. The reversal of 2121221941 is 1491221212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1503500625 + 617721316 = 38775^2 + 24854^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121221941 - 2³ = 2121221933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121221911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060610970 + 1060610971.

It is an arithmetic number, because the mean of its divisors is an integer number (1060610971).

Almost surely, 2^2121221941 is an apocalyptic number.

It is an amenable number.

2121221941 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121221941 is an equidigital number, since it uses as much as digits as its factorization.

2121221941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

The square root of 2121221941 is about 46056.7252526708. The cubic root of 2121221941 is about 1284.8784254162.

The spelling of 2121221941 in words is "two billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred forty-one".