25025021 has 4 divisors (see below), whose sum is σ = 28600032. Its totient is φ = 21450012.

The previous prime is 25024981. The next prime is 25025041. The reversal of 25025021 is 12052052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25025021 is a prime.

It is a super-3 number, since 3×25025021³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25025041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1787495 + ... + 1787508.

It is an arithmetic number, because the mean of its divisors is an integer number (7150008).

Almost surely, 2^25025021 is an apocalyptic number.

It is an amenable number.

25025021 is a deficient number, since it is larger than the sum of its proper divisors (3575011).

25025021 is an equidigital number, since it uses as much as digits as its factorization.

25025021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3575010.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 25025021 is about 5002.5014742627. The cubic root of 25025021 is about 292.4992904261.

Adding to 25025021 its reverse (12052052), we get a palindrome (37077073).

The spelling of 25025021 in words is "twenty-five million, twenty-five thousand, twenty-one".