2221187957 has 2 divisors, whose sum is σ = 2221187958. Its totient is φ = 2221187956.

The previous prime is 2221187929. The next prime is 2221188049. The reversal of 2221187957 is 7597811222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2206086961 + 15100996 = 46969^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221187957 - 2³⁰ = 1147446133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221180957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110593978 + 1110593979.

It is an arithmetic number, because the mean of its divisors is an integer number (1110593979).

Almost surely, 2^2221187957 is an apocalyptic number.

It is an amenable number.

2221187957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221187957 is an equidigital number, since it uses as much as digits as its factorization.

2221187957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 44.

The square root of 2221187957 is about 47129.4807631062. The cubic root of 2221187957 is about 1304.7533984008.

The spelling of 2221187957 in words is "two billion, two hundred twenty-one million, one hundred eighty-seven thousand, nine hundred fifty-seven".