2251036721123 has 2 divisors, whose sum is σ = 2251036721124. Its totient is φ = 2251036721122.

The previous prime is 2251036721117. The next prime is 2251036721173. The reversal of 2251036721123 is 3211276301522.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2251036721123 is a prime.

It is a super-2 number, since 2×2251036721123² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2251036721173) 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, 1125518360561 + 1125518360562.

It is an arithmetic number, because the mean of its divisors is an integer number (1125518360562).

Almost surely, 2^{2251036721123} is an apocalyptic number.

2251036721123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2251036721123 is an equidigital number, since it uses as much as digits as its factorization.

2251036721123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 2251036721123 in words is "two trillion, two hundred fifty-one billion, thirty-six million, seven hundred twenty-one thousand, one hundred twenty-three".