2102820761 has 2 divisors, whose sum is σ = 2102820762. Its totient is φ = 2102820760.

The previous prime is 2102820757. The next prime is 2102820779. The reversal of 2102820761 is 1670282012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1899216400 + 203604361 = 43580^2 + 14269^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102820761 - 2² = 2102820757 is a prime.

It is not a weakly prime, because it can be changed into another prime (2102820721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051410380 + 1051410381.

It is an arithmetic number, because the mean of its divisors is an integer number (1051410381).

Almost surely, 2^2102820761 is an apocalyptic number.

It is an amenable number.

2102820761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102820761 is an equidigital number, since it uses as much as digits as its factorization.

2102820761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 2102820761 is about 45856.5236471323. The cubic root of 2102820761 is about 1281.1522747720.

The spelling of 2102820761 in words is "two billion, one hundred two million, eight hundred twenty thousand, seven hundred sixty-one".