25167421 has 4 divisors (see below), whose sum is σ = 25642332. Its totient is φ = 24692512.

The previous prime is 25167409. The next prime is 25167433. The reversal of 25167421 is 12476152.

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

It is an interprime number because it is at equal distance from previous prime (25167409) and next prime (25167433).

It can be written as a sum of positive squares in 2 ways, for example, as 17388900 + 7778521 = 4170^2 + 2789^2 .

It is a cyclic number.

It is not a de Polignac number, because 25167421 - 2¹³ = 25159229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25167421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25167491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237376 + ... + 237481.

It is an arithmetic number, because the mean of its divisors is an integer number (6410583).

Almost surely, 2^25167421 is an apocalyptic number.

It is an amenable number.

25167421 is a deficient number, since it is larger than the sum of its proper divisors (474911).

25167421 is an equidigital number, since it uses as much as digits as its factorization.

25167421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474910.

The product of its digits is 3360, while the sum is 28.

The square root of 25167421 is about 5016.7141636733. The cubic root of 25167421 is about 293.0530447901.

It can be divided in two parts, 251674 and 21, that added together give a triangular number (251695 = T₇₀₉).

The spelling of 25167421 in words is "twenty-five million, one hundred sixty-seven thousand, four hundred twenty-one".