25152421 has 4 divisors (see below), whose sum is σ = 28745632. Its totient is φ = 21559212.

The previous prime is 25152419. The next prime is 25152427. The reversal of 25152421 is 12425152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25152421 - 2¹ = 25152419 is a prime.

It is a super-2 number, since 2×25152421² = 1265288564322482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25152392 and 25152401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25152427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796595 + ... + 1796608.

It is an arithmetic number, because the mean of its divisors is an integer number (7186408).

Almost surely, 2^25152421 is an apocalyptic number.

It is an amenable number.

25152421 is a deficient number, since it is larger than the sum of its proper divisors (3593211).

25152421 is an equidigital number, since it uses as much as digits as its factorization.

25152421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593210.

The product of its digits is 800, while the sum is 22.

The square root of 25152421 is about 5015.2189383914. The cubic root of 25152421 is about 292.9948125055.

Adding to 25152421 its reverse (12425152), we get a palindrome (37577573).

The spelling of 25152421 in words is "twenty-five million, one hundred fifty-two thousand, four hundred twenty-one".