25042021 has 4 divisors (see below), whose sum is σ = 25652844. Its totient is φ = 24431200.

The previous prime is 25042001. The next prime is 25042033. The reversal of 25042021 is 12024052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10304100 + 14737921 = 3210^2 + 3839^2 .

It is a cyclic number.

It is not a de Polignac number, because 25042021 - 2⁹ = 25041509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25041986 and 25042004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25042001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305350 + ... + 305431.

It is an arithmetic number, because the mean of its divisors is an integer number (6413211).

Almost surely, 2^25042021 is an apocalyptic number.

It is an amenable number.

25042021 is a deficient number, since it is larger than the sum of its proper divisors (610823).

25042021 is an equidigital number, since it uses as much as digits as its factorization.

25042021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610822.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 25042021 is about 5004.2003357180. The cubic root of 25042021 is about 292.5655089838.

Adding to 25042021 its reverse (12024052), we get a palindrome (37066073).

The spelling of 25042021 in words is "twenty-five million, forty-two thousand, twenty-one".