2100015806797 has 2 divisors, whose sum is σ = 2100015806798. Its totient is φ = 2100015806796.

The previous prime is 2100015806783. The next prime is 2100015806827. The reversal of 2100015806797 is 7976085100012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1854033533641 + 245982273156 = 1361629^2 + 495966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100015806797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100015806717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050007903398 + 1050007903399.

It is an arithmetic number, because the mean of its divisors is an integer number (1050007903399).

Almost surely, 2^{2100015806797} is an apocalyptic number.

It is an amenable number.

2100015806797 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100015806797 is an equidigital number, since it uses as much as digits as its factorization.

2100015806797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 46.

The spelling of 2100015806797 in words is "two trillion, one hundred billion, fifteen million, eight hundred six thousand, seven hundred ninety-seven".