2100646996451 has 2 divisors, whose sum is σ = 2100646996452. Its totient is φ = 2100646996450.

The previous prime is 2100646996423. The next prime is 2100646996453. The reversal of 2100646996451 is 1546996460012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100646996451 - 2³⁰ = 2099573254627 is a prime.

Together with 2100646996453, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100646996393 and 2100646996402.

It is not a weakly prime, because it can be changed into another prime (2100646996453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050323498225 + 1050323498226.

It is an arithmetic number, because the mean of its divisors is an integer number (1050323498226).

Almost surely, 2^{2100646996451} is an apocalyptic number.

2100646996451 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100646996451 is an equidigital number, since it uses as much as digits as its factorization.

2100646996451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 2100646996451 in words is "two trillion, one hundred billion, six hundred forty-six million, nine hundred ninety-six thousand, four hundred fifty-one".