21250225666589 has 2 divisors, whose sum is σ = 21250225666590. Its totient is φ = 21250225666588.

The previous prime is 21250225666543. The next prime is 21250225666591. The reversal of 21250225666589 is 98566652205212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21135259236100 + 114966430489 = 4597310^2 + 339067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250225666589 is a prime.

Together with 21250225666591, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21250225666519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625112833294 + 10625112833295.

It is an arithmetic number, because the mean of its divisors is an integer number (10625112833295).

Almost surely, 2^{21250225666589} is an apocalyptic number.

It is an amenable number.

21250225666589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250225666589 is an equidigital number, since it uses as much as digits as its factorization.

21250225666589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104000, while the sum is 59.

The spelling of 21250225666589 in words is "twenty-one trillion, two hundred fifty billion, two hundred twenty-five million, six hundred sixty-six thousand, five hundred eighty-nine".