2100026199961 has 2 divisors, whose sum is σ = 2100026199962. Its totient is φ = 2100026199960.

The previous prime is 2100026199899. The next prime is 2100026200043. The reversal of 2100026199961 is 1699916200012.

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., 1866598075225 + 233428124736 = 1366235^2 + 483144^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100026199961 - 2⁷ = 2100026199833 is a prime.

It is a super-2 number, since 2×2100026199961² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2100026199461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050013099980 + 1050013099981.

It is an arithmetic number, because the mean of its divisors is an integer number (1050013099981).

Almost surely, 2^{2100026199961} is an apocalyptic number.

It is an amenable number.

2100026199961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100026199961 is an equidigital number, since it uses as much as digits as its factorization.

2100026199961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 46.

The spelling of 2100026199961 in words is "two trillion, one hundred billion, twenty-six million, one hundred ninety-nine thousand, nine hundred sixty-one".