25235142421 has 2 divisors, whose sum is σ = 25235142422. Its totient is φ = 25235142420.

The previous prime is 25235142419. The next prime is 25235142433. The reversal of 25235142421 is 12424153252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24870867025 + 364275396 = 157705^2 + 19086^2 .

It is a cyclic number.

It is not a de Polignac number, because 25235142421 - 2¹ = 25235142419 is a prime.

Together with 25235142419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25235142451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12617571210 + 12617571211.

It is an arithmetic number, because the mean of its divisors is an integer number (12617571211).

Almost surely, 2^25235142421 is an apocalyptic number.

It is an amenable number.

25235142421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25235142421 is an equidigital number, since it uses as much as digits as its factorization.

25235142421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 31.

Adding to 25235142421 its reverse (12424153252), we get a palindrome (37659295673).

The spelling of 25235142421 in words is "twenty-five billion, two hundred thirty-five million, one hundred forty-two thousand, four hundred twenty-one".