2100113261 has 2 divisors, whose sum is σ = 2100113262. Its totient is φ = 2100113260.

The previous prime is 2100113209. The next prime is 2100113273. The reversal of 2100113261 is 1623110012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2063884900 + 36228361 = 45430^2 + 6019^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100113261 - 2¹⁴ = 2100096877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100143261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050056630 + 1050056631.

It is an arithmetic number, because the mean of its divisors is an integer number (1050056631).

Almost surely, 2^2100113261 is an apocalyptic number.

It is an amenable number.

2100113261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100113261 is an equidigital number, since it uses as much as digits as its factorization.

2100113261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2100113261 is about 45826.9927117196. The cubic root of 2100113261 is about 1280.6021867445.

Adding to 2100113261 its reverse (1623110012), we get a palindrome (3723223273).

The spelling of 2100113261 in words is "two billion, one hundred million, one hundred thirteen thousand, two hundred sixty-one".