25521134201 has 2 divisors, whose sum is σ = 25521134202. Its totient is φ = 25521134200.

The previous prime is 25521134173. The next prime is 25521134203. The reversal of 25521134201 is 10243112552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13497792400 + 12023341801 = 116180^2 + 109651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25521134201 is a prime.

Together with 25521134203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25521134203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760567100 + 12760567101.

It is an arithmetic number, because the mean of its divisors is an integer number (12760567101).

Almost surely, 2^25521134201 is an apocalyptic number.

It is an amenable number.

25521134201 is a deficient number, since it is larger than the sum of its proper divisors (1).

25521134201 is an equidigital number, since it uses as much as digits as its factorization.

25521134201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 25521134201 its reverse (10243112552), we get a palindrome (35764246753).

The spelling of 25521134201 in words is "twenty-five billion, five hundred twenty-one million, one hundred thirty-four thousand, two hundred one".