25221430 has 32 divisors (see below), whose sum is σ = 49297248. Its totient is φ = 9235200.

The previous prime is 25221419. The next prime is 25221467. The reversal of 25221430 is 3412252.

It is a super-2 number, since 2×25221430² = 1272241062489800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25221398 and 25221407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16290 + ... + 17770.

It is an arithmetic number, because the mean of its divisors is an integer number (1540539).

Almost surely, 2^25221430 is an apocalyptic number.

25221430 is a deficient number, since it is larger than the sum of its proper divisors (24075818).

25221430 is a wasteful number, since it uses less digits than its factorization.

25221430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 25221430 is about 5022.0941847002. The cubic root of 25221430 is about 293.2625245178.

Adding to 25221430 its reverse (3412252), we get a palindrome (28633682).

It can be divided in two parts, 25221 and 430, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 25221430 in words is "twenty-five million, two hundred twenty-one thousand, four hundred thirty".