2121571057 has 2 divisors, whose sum is σ = 2121571058. Its totient is φ = 2121571056.

The previous prime is 2121571021. The next prime is 2121571063. The reversal of 2121571057 is 7501751212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2068339441 + 53231616 = 45479^2 + 7296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121571057 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121571007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060785528 + 1060785529.

It is an arithmetic number, because the mean of its divisors is an integer number (1060785529).

Almost surely, 2^2121571057 is an apocalyptic number.

It is an amenable number.

2121571057 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121571057 is an equidigital number, since it uses as much as digits as its factorization.

2121571057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4900, while the sum is 31.

The square root of 2121571057 is about 46060.5151621212. The cubic root of 2121571057 is about 1284.9489110485.

The spelling of 2121571057 in words is "two billion, one hundred twenty-one million, five hundred seventy-one thousand, fifty-seven".