2120839957 has 2 divisors, whose sum is σ = 2120839958. Its totient is φ = 2120839956.

The previous prime is 2120839933. The next prime is 2120839967. The reversal of 2120839957 is 7599380212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1953551601 + 167288356 = 44199^2 + 12934^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120839957 - 2¹⁹ = 2120315669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120839927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060419978 + 1060419979.

It is an arithmetic number, because the mean of its divisors is an integer number (1060419979).

Almost surely, 2^2120839957 is an apocalyptic number.

It is an amenable number.

2120839957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120839957 is an equidigital number, since it uses as much as digits as its factorization.

2120839957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 2120839957 is about 46052.5781797284. The cubic root of 2120839957 is about 1284.8012949574.

The spelling of 2120839957 in words is "two billion, one hundred twenty million, eight hundred thirty-nine thousand, nine hundred fifty-seven".