25442421 has 32 divisors (see below), whose sum is σ = 37537920. Its totient is φ = 15261696.

The previous prime is 25442419. The next prime is 25442423. The reversal of 25442421 is 12424452.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25442419) and next prime (25442423).

It is not a de Polignac number, because 25442421 - 2¹ = 25442419 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25442391 and 25442400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25442423) 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 31 ways as a sum of consecutive naturals, for example, 182970 + ... + 183108.

It is an arithmetic number, because the mean of its divisors is an integer number (1173060).

Almost surely, 2^25442421 is an apocalyptic number.

It is an amenable number.

25442421 is a deficient number, since it is larger than the sum of its proper divisors (12095499).

25442421 is a wasteful number, since it uses less digits than its factorization.

25442421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293.

The product of its digits is 2560, while the sum is 24.

The square root of 25442421 is about 5044.0480766940. The cubic root of 25442421 is about 294.1165602885.

Adding to 25442421 its reverse (12424452), we get a palindrome (37866873).

The spelling of 25442421 in words is "twenty-five million, four hundred forty-two thousand, four hundred twenty-one".