2100120021157 has 2 divisors, whose sum is σ = 2100120021158. Its totient is φ = 2100120021156.

The previous prime is 2100120021079. The next prime is 2100120021169. The reversal of 2100120021157 is 7511200210012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1895575486401 + 204544534756 = 1376799^2 + 452266^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100120021157 - 2¹⁵ = 2100119988389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100120021257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050060010578 + 1050060010579.

It is an arithmetic number, because the mean of its divisors is an integer number (1050060010579).

Almost surely, 2^{2100120021157} is an apocalyptic number.

It is an amenable number.

2100120021157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100120021157 is an equidigital number, since it uses as much as digits as its factorization.

2100120021157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 22.

Adding to 2100120021157 its reverse (7511200210012), we get a palindrome (9611320231169).

The spelling of 2100120021157 in words is "two trillion, one hundred billion, one hundred twenty million, twenty-one thousand, one hundred fifty-seven".