25269921944921 has 2 divisors, whose sum is σ = 25269921944922. Its totient is φ = 25269921944920.

The previous prime is 25269921944909. The next prime is 25269921944999. The reversal of 25269921944921 is 12944912996252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19321396063321 + 5948525881600 = 4395611^2 + 2438960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25269921944921 is a prime.

It is not a weakly prime, because it can be changed into another prime (25269921944221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12634960972460 + 12634960972461.

It is an arithmetic number, because the mean of its divisors is an integer number (12634960972461).

Almost surely, 2^{25269921944921} is an apocalyptic number.

It is an amenable number.

25269921944921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25269921944921 is an equidigital number, since it uses as much as digits as its factorization.

25269921944921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50388480, while the sum is 65.

The spelling of 25269921944921 in words is "twenty-five trillion, two hundred sixty-nine billion, nine hundred twenty-one million, nine hundred forty-four thousand, nine hundred twenty-one".