25424154221 has 2 divisors, whose sum is σ = 25424154222. Its totient is φ = 25424154220.

The previous prime is 25424154139. The next prime is 25424154229. The reversal of 25424154221 is 12245142452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25277502121 + 146652100 = 158989^2 + 12110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25424154221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25424154229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12712077110 + 12712077111.

It is an arithmetic number, because the mean of its divisors is an integer number (12712077111).

Almost surely, 2^25424154221 is an apocalyptic number.

It is an amenable number.

25424154221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25424154221 is an equidigital number, since it uses as much as digits as its factorization.

25424154221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25600, while the sum is 32.

Adding to 25424154221 its reverse (12245142452), we get a palindrome (37669296673).

The spelling of 25424154221 in words is "twenty-five billion, four hundred twenty-four million, one hundred fifty-four thousand, two hundred twenty-one".