25010021 has 2 divisors, whose sum is σ = 25010022. Its totient is φ = 25010020.

The previous prime is 25010003. The next prime is 25010033. The reversal of 25010021 is 12001052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 4669921 = 4510^2 + 2161^2 .

It is a cyclic number.

It is not a de Polignac number, because 25010021 - 2¹⁴ = 24993637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25009984 and 25010011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25010071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12505010 + 12505011.

It is an arithmetic number, because the mean of its divisors is an integer number (12505011).

Almost surely, 2^25010021 is an apocalyptic number.

It is an amenable number.

25010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25010021 is an equidigital number, since it uses as much as digits as its factorization.

25010021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 25010021 is about 5001.0019995997. The cubic root of 25010021 is about 292.4408373780.

Subtracting from 25010021 its product of nonzero digits (20), we obtain a square (25010001 = 5001²).

Adding to 25010021 its reverse (12001052), we get a palindrome (37011073).

The spelling of 25010021 in words is "twenty-five million, ten thousand, twenty-one".