25109247421 has 2 divisors, whose sum is σ = 25109247422. Its totient is φ = 25109247420.

The previous prime is 25109247349. The next prime is 25109247431. The reversal of 25109247421 is 12474290152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19778203225 + 5331044196 = 140635^2 + 73014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25109247421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25109247431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12554623710 + 12554623711.

It is an arithmetic number, because the mean of its divisors is an integer number (12554623711).

Almost surely, 2^25109247421 is an apocalyptic number.

It is an amenable number.

25109247421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25109247421 is an equidigital number, since it uses as much as digits as its factorization.

25109247421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 25109247421 in words is "twenty-five billion, one hundred nine million, two hundred forty-seven thousand, four hundred twenty-one".