21625430 has 8 divisors (see below), whose sum is σ = 38925792. Its totient is φ = 8650168.

The previous prime is 21625397. The next prime is 21625453. The reversal of 21625430 is 3452612.

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

It is a junction number, because it is equal to n+sod(n) for n = 21625396 and 21625405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1081262 + ... + 1081281.

It is an arithmetic number, because the mean of its divisors is an integer number (4865724).

Almost surely, 2^21625430 is an apocalyptic number.

21625430 is a deficient number, since it is larger than the sum of its proper divisors (17300362).

21625430 is a wasteful number, since it uses less digits than its factorization.

21625430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162550.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21625430 is about 4650.3150430912. The cubic root of 21625430 is about 278.6045793803.

The spelling of 21625430 in words is "twenty-one million, six hundred twenty-five thousand, four hundred thirty".