25535421 has 12 divisors (see below), whose sum is σ = 37742848. Its totient is φ = 16627464.

The previous prime is 25535381. The next prime is 25535441. The reversal of 25535421 is 12453552.

It is a happy number.

It is not a de Polignac number, because 25535421 - 2⁶ = 25535357 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 (25535441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32605 + ... + 33378.

Almost surely, 2^25535421 is an apocalyptic number.

It is an amenable number.

25535421 is a deficient number, since it is larger than the sum of its proper divisors (12207427).

25535421 is a wasteful number, since it uses less digits than its factorization.

25535421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66032 (or 66029 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 25535421 is about 5053.2584537108. The cubic root of 25535421 is about 294.4744871789.

Adding to 25535421 its reverse (12453552), we get a palindrome (37988973).

The spelling of 25535421 in words is "twenty-five million, five hundred thirty-five thousand, four hundred twenty-one".