210021096815797 has 2 divisors, whose sum is σ = 210021096815798. Its totient is φ = 210021096815796.

The previous prime is 210021096815759. The next prime is 210021096815801. The reversal of 210021096815797 is 797518690120012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186512310616401 + 23508786199396 = 13656951^2 + 4848586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021096815797 is a prime.

It is a super-2 number, since 2×210021096815797² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210021096815197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010548407898 + 105010548407899.

It is an arithmetic number, because the mean of its divisors is an integer number (105010548407899).

Almost surely, 2^{210021096815797} is an apocalyptic number.

It is an amenable number.

210021096815797 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021096815797 is an equidigital number, since it uses as much as digits as its factorization.

210021096815797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 58.

The spelling of 210021096815797 in words is "two hundred ten trillion, twenty-one billion, ninety-six million, eight hundred fifteen thousand, seven hundred ninety-seven".