25942021 has 12 divisors (see below), whose sum is σ = 30277260. Its totient is φ = 22162560.

The previous prime is 25941997. The next prime is 25942093. The reversal of 25942021 is 12024952.

It can be written as a sum of positive squares in 2 ways, for example, as 5239521 + 20702500 = 2289^2 + 4550^2 .

It is not a de Polignac number, because 25942021 - 2⁵ = 25941989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25942121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18381 + ... + 19741.

It is an arithmetic number, because the mean of its divisors is an integer number (2523105).

Almost surely, 2^25942021 is an apocalyptic number.

It is an amenable number.

25942021 is a deficient number, since it is larger than the sum of its proper divisors (4335239).

25942021 is a wasteful number, since it uses less digits than its factorization.

25942021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764 (or 1757 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 25942021 is about 5093.3310318494. The cubic root of 25942021 is about 296.0292345425.

Adding to 25942021 its reverse (12024952), we get a palindrome (37966973).

The spelling of 25942021 in words is "twenty-five million, nine hundred forty-two thousand, twenty-one".