2100400079 has 2 divisors, whose sum is σ = 2100400080. Its totient is φ = 2100400078.

The previous prime is 2100400051. The next prime is 2100400109. The reversal of 2100400079 is 9700040012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100400079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100400579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050200039 + 1050200040.

It is an arithmetic number, because the mean of its divisors is an integer number (1050200040).

Almost surely, 2^2100400079 is an apocalyptic number.

2100400079 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100400079 is an equidigital number, since it uses as much as digits as its factorization.

2100400079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 2100400079 is about 45830.1219614349. The cubic root of 2100400079 is about 1280.6604824954.

The spelling of 2100400079 in words is "two billion, one hundred million, four hundred thousand, seventy-nine".