25155421 has 4 divisors (see below), whose sum is σ = 25265500. Its totient is φ = 25045344.

The previous prime is 25155413. The next prime is 25155433. The reversal of 25155421 is 12455152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13176900 + 11978521 = 3630^2 + 3461^2 .

It is a cyclic number.

It is not a de Polignac number, because 25155421 - 2³ = 25155413 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 (25155451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54696 + ... + 55153.

It is an arithmetic number, because the mean of its divisors is an integer number (6316375).

Almost surely, 2^25155421 is an apocalyptic number.

It is an amenable number.

25155421 is a deficient number, since it is larger than the sum of its proper divisors (110079).

25155421 is a wasteful number, since it uses less digits than its factorization.

25155421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110078.

The product of its digits is 2000, while the sum is 25.

The square root of 25155421 is about 5015.5180191083. The cubic root of 25155421 is about 293.0064608142.

The spelling of 25155421 in words is "twenty-five million, one hundred fifty-five thousand, four hundred twenty-one".