21250623536297 has 2 divisors, whose sum is σ = 21250623536298. Its totient is φ = 21250623536296.

The previous prime is 21250623536237. The next prime is 21250623536299. The reversal of 21250623536297 is 79263532605212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19103053455616 + 2147570080681 = 4370704^2 + 1465459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250623536297 is a prime.

Together with 21250623536299, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21250623536299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625311768148 + 10625311768149.

It is an arithmetic number, because the mean of its divisors is an integer number (10625311768149).

Almost surely, 2^{21250623536297} is an apocalyptic number.

It is an amenable number.

21250623536297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250623536297 is an equidigital number, since it uses as much as digits as its factorization.

21250623536297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 53.

The spelling of 21250623536297 in words is "twenty-one trillion, two hundred fifty billion, six hundred twenty-three million, five hundred thirty-six thousand, two hundred ninety-seven".