2102110999957 has 4 divisors (see below), whose sum is σ = 2102441474956. Its totient is φ = 2101780524960.

The previous prime is 2102110999939. The next prime is 2102110999997. The reversal of 2102110999957 is 7599990112012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 274082613841 + 1828028386116 = 523529^2 + 1352046^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102110999957 - 2¹⁹ = 2102110475669 is a prime.

It is a super-2 number, since 2×2102110999957² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102110999898 and 2102110999907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102110999997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165227958 + ... + 165240679.

It is an arithmetic number, because the mean of its divisors is an integer number (525610368739).

Almost surely, 2^{2102110999957} is an apocalyptic number.

It is an amenable number.

2102110999957 is a deficient number, since it is larger than the sum of its proper divisors (330474999).

2102110999957 is an equidigital number, since it uses as much as digits as its factorization.

2102110999957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330474998.

The product of its (nonzero) digits is 918540, while the sum is 55.

The spelling of 2102110999957 in words is "two trillion, one hundred two billion, one hundred ten million, nine hundred ninety-nine thousand, nine hundred fifty-seven".