25212421 has 8 divisors (see below), whose sum is σ = 27367424. Its totient is φ = 23088240.

The previous prime is 25212413. The next prime is 25212433. The reversal of 25212421 is 12421252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25212421 - 2³ = 25212413 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 (25212401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5985 + ... + 9286.

It is an arithmetic number, because the mean of its divisors is an integer number (3420928).

Almost surely, 2^25212421 is an apocalyptic number.

It is an amenable number.

25212421 is a deficient number, since it is larger than the sum of its proper divisors (2155003).

25212421 is a wasteful number, since it uses less digits than its factorization.

25212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15411.

The product of its digits is 320, while the sum is 19.

The square root of 25212421 is about 5021.1971680068. The cubic root of 25212421 is about 293.2276029357.

Adding to 25212421 its reverse (12421252), we get a palindrome (37633673).

The spelling of 25212421 in words is "twenty-five million, two hundred twelve thousand, four hundred twenty-one".