2100042100957 has 2 divisors, whose sum is σ = 2100042100958. Its totient is φ = 2100042100956.

The previous prime is 2100042100943. The next prime is 2100042100993. The reversal of 2100042100957 is 7590012400012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1117701441796 + 982340659161 = 1057214^2 + 991131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100042100957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100042140957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050021050478 + 1050021050479.

It is an arithmetic number, because the mean of its divisors is an integer number (1050021050479).

Almost surely, 2^{2100042100957} is an apocalyptic number.

It is an amenable number.

2100042100957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100042100957 is an equidigital number, since it uses as much as digits as its factorization.

2100042100957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

Adding to 2100042100957 its reverse (7590012400012), we get a palindrome (9690054500969).

The spelling of 2100042100957 in words is "two trillion, one hundred billion, forty-two million, one hundred thousand, nine hundred fifty-seven".