25500553030021 has 2 divisors, whose sum is σ = 25500553030022. Its totient is φ = 25500553030020.

The previous prime is 25500553030003. The next prime is 25500553030033. The reversal of 25500553030021 is 12003035500552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22897315992996 + 2603237037025 = 4785114^2 + 1613455^2 .

It is a cyclic number.

It is not a de Polignac number, because 25500553030021 - 2¹¹ = 25500553027973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25500553030081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12750276515010 + 12750276515011.

It is an arithmetic number, because the mean of its divisors is an integer number (12750276515011).

Almost surely, 2^{25500553030021} is an apocalyptic number.

It is an amenable number.

25500553030021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25500553030021 is an equidigital number, since it uses as much as digits as its factorization.

25500553030021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 31.

Adding to 25500553030021 its reverse (12003035500552), we get a palindrome (37503588530573).

The spelling of 25500553030021 in words is "twenty-five trillion, five hundred billion, five hundred fifty-three million, thirty thousand, twenty-one".