25300021 has 2 divisors, whose sum is σ = 25300022. Its totient is φ = 25300020.

The previous prime is 25300013. The next prime is 25300049. The reversal of 25300021 is 12000352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24059025 + 1240996 = 4905^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 25300021 - 2³ = 25300013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25299974 and 25300010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25300081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12650010 + 12650011.

It is an arithmetic number, because the mean of its divisors is an integer number (12650011).

Almost surely, 2^25300021 is an apocalyptic number.

It is an amenable number.

25300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25300021 is an equidigital number, since it uses as much as digits as its factorization.

25300021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 25300021 is about 5029.9126234956. The cubic root of 25300021 is about 293.5668146543.

Adding to 25300021 its reverse (12000352), we get a palindrome (37300373).

The spelling of 25300021 in words is "twenty-five million, three hundred thousand, twenty-one".