25025250221 has 2 divisors, whose sum is σ = 25025250222. Its totient is φ = 25025250220.

The previous prime is 25025250191. The next prime is 25025250233. The reversal of 25025250221 is 12205252052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23967374596 + 1057875625 = 154814^2 + 32525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25025250221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25025250281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12512625110 + 12512625111.

It is an arithmetic number, because the mean of its divisors is an integer number (12512625111).

Almost surely, 2^25025250221 is an apocalyptic number.

It is an amenable number.

25025250221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25025250221 is an equidigital number, since it uses as much as digits as its factorization.

25025250221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 26.

The spelling of 25025250221 in words is "twenty-five billion, twenty-five million, two hundred fifty thousand, two hundred twenty-one".