2158250814721 has 2 divisors, whose sum is σ = 2158250814722. Its totient is φ = 2158250814720.

The previous prime is 2158250814701. The next prime is 2158250814739. The reversal of 2158250814721 is 1274180528512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2094492039696 + 63758775025 = 1447236^2 + 252505^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158250814721 - 2⁷ = 2158250814593 is a prime.

It is not a weakly prime, because it can be changed into another prime (2158250814701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079125407360 + 1079125407361.

It is an arithmetic number, because the mean of its divisors is an integer number (1079125407361).

Almost surely, 2^{2158250814721} is an apocalyptic number.

It is an amenable number.

2158250814721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158250814721 is an equidigital number, since it uses as much as digits as its factorization.

2158250814721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 358400, while the sum is 46.

The spelling of 2158250814721 in words is "two trillion, one hundred fifty-eight billion, two hundred fifty million, eight hundred fourteen thousand, seven hundred twenty-one".