21250200997 has 2 divisors, whose sum is σ = 21250200998. Its totient is φ = 21250200996.

The previous prime is 21250200977. The next prime is 21250201001. The reversal of 21250200997 is 79900205212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20619236836 + 630964161 = 143594^2 + 25119^2 .

It is a cyclic number.

It is not a de Polignac number, because 21250200997 - 2⁷ = 21250200869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21250200947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625100498 + 10625100499.

It is an arithmetic number, because the mean of its divisors is an integer number (10625100499).

Almost surely, 2^21250200997 is an apocalyptic number.

It is an amenable number.

21250200997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250200997 is an equidigital number, since it uses as much as digits as its factorization.

21250200997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 21250200997 in words is "twenty-one billion, two hundred fifty million, two hundred thousand, nine hundred ninety-seven".