25433021 has 2 divisors, whose sum is σ = 25433022. Its totient is φ = 25433020.

The previous prime is 25432993. The next prime is 25433027. The reversal of 25433021 is 12033452.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25351225 + 81796 = 5035^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 25433021 - 2²² = 21238717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25432984 and 25433002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25433027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12716510 + 12716511.

It is an arithmetic number, because the mean of its divisors is an integer number (12716511).

Almost surely, 2^25433021 is an apocalyptic number.

It is an amenable number.

25433021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25433021 is an equidigital number, since it uses as much as digits as its factorization.

25433021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 25433021 is about 5043.1161993355. The cubic root of 25433021 is about 294.0803342258.

Adding to 25433021 its reverse (12033452), we get a palindrome (37466473).

The spelling of 25433021 in words is "twenty-five million, four hundred thirty-three thousand, twenty-one".