25106502342421 has 2 divisors, whose sum is σ = 25106502342422. Its totient is φ = 25106502342420.

The previous prime is 25106502342377. The next prime is 25106502342443. The reversal of 25106502342421 is 12424320560152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21440372640625 + 3666129701796 = 4630375^2 + 1914714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25106502342421 is a prime.

It is a super-2 number, since 2×25106502342421² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25106502342121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12553251171210 + 12553251171211.

It is an arithmetic number, because the mean of its divisors is an integer number (12553251171211).

Almost surely, 2^{25106502342421} is an apocalyptic number.

It is an amenable number.

25106502342421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25106502342421 is an equidigital number, since it uses as much as digits as its factorization.

25106502342421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 25106502342421 in words is "twenty-five trillion, one hundred six billion, five hundred two million, three hundred forty-two thousand, four hundred twenty-one".