25142423221 has 2 divisors, whose sum is σ = 25142423222. Its totient is φ = 25142423220.

The previous prime is 25142423203. The next prime is 25142423249. The reversal of 25142423221 is 12232424152.

It is an a-pointer prime, because the next prime (25142423249) can be obtained adding 25142423221 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13258371025 + 11884052196 = 115145^2 + 109014^2 .

It is a cyclic number.

It is not a de Polignac number, because 25142423221 - 2²¹ = 25140326069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25142423221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25142423281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12571211610 + 12571211611.

It is an arithmetic number, because the mean of its divisors is an integer number (12571211611).

Almost surely, 2^25142423221 is an apocalyptic number.

It is an amenable number.

25142423221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25142423221 is an equidigital number, since it uses as much as digits as its factorization.

25142423221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 28.

Adding to 25142423221 its reverse (12232424152), we get a palindrome (37374847373).

The spelling of 25142423221 in words is "twenty-five billion, one hundred forty-two million, four hundred twenty-three thousand, two hundred twenty-one".