25436021 has 12 divisors (see below), whose sum is σ = 28020960. Its totient is φ = 23072400.

The previous prime is 25436011. The next prime is 25436051. The reversal of 25436021 is 12063452.

It is a de Polignac number, because none of the positive numbers 2^k-25436021 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 (25436011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8696 + ... + 11246.

It is an arithmetic number, because the mean of its divisors is an integer number (2335080).

Almost surely, 2^25436021 is an apocalyptic number.

It is an amenable number.

25436021 is a deficient number, since it is larger than the sum of its proper divisors (2584939).

25436021 is a wasteful number, since it uses less digits than its factorization.

25436021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636 (or 2623 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 25436021 is about 5043.4136257103. The cubic root of 25436021 is about 294.0918967048.

Adding to 25436021 its reverse (12063452), we get a palindrome (37499473).

The spelling of 25436021 in words is "twenty-five million, four hundred thirty-six thousand, twenty-one".