25355421 has 48 divisors (see below), whose sum is σ = 45741696. Its totient is φ = 13177728.

The previous prime is 25355417. The next prime is 25355431. The reversal of 25355421 is 12455352.

It is a happy number.

It is not a de Polignac number, because 25355421 - 2² = 25355417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25355401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67791 + ... + 68163.

It is an arithmetic number, because the mean of its divisors is an integer number (952952).

Almost surely, 2^25355421 is an apocalyptic number.

25355421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25355421 is a deficient number, since it is larger than the sum of its proper divisors (20386275).

25355421 is a wasteful number, since it uses less digits than its factorization.

25355421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482 (or 479 counting only the distinct ones).

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

The square root of 25355421 is about 5035.4166659771. The cubic root of 25355421 is about 293.7809349645.

The spelling of 25355421 in words is "twenty-five million, three hundred fifty-five thousand, four hundred twenty-one".