25224104021 has 2 divisors, whose sum is σ = 25224104022. Its totient is φ = 25224104020.

The previous prime is 25224103969. The next prime is 25224104047. The reversal of 25224104021 is 12040142252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15404284996 + 9819819025 = 124114^2 + 99095^2 .

It is a cyclic number.

It is not a de Polignac number, because 25224104021 - 2³⁴ = 8044234837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25224104051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12612052010 + 12612052011.

It is an arithmetic number, because the mean of its divisors is an integer number (12612052011).

Almost surely, 2^25224104021 is an apocalyptic number.

It is an amenable number.

25224104021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25224104021 is an equidigital number, since it uses as much as digits as its factorization.

25224104021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 25224104021 its reverse (12040142252), we get a palindrome (37264246273).

The spelling of 25224104021 in words is "twenty-five billion, two hundred twenty-four million, one hundred four thousand, twenty-one".