21952430 has 8 divisors (see below), whose sum is σ = 39514392. Its totient is φ = 8780968.

The previous prime is 21952387. The next prime is 21952459. The reversal of 21952430 is 3425912.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21952430.

It is a congruent number.

It is an unprimeable number.

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, 1097612 + ... + 1097631.

It is an arithmetic number, because the mean of its divisors is an integer number (4939299).

Almost surely, 2^21952430 is an apocalyptic number.

21952430 is a deficient number, since it is larger than the sum of its proper divisors (17561962).

21952430 is a wasteful number, since it uses less digits than its factorization.

21952430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195250.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21952430 is about 4685.3420366074. The cubic root of 21952430 is about 280.0018282194.

The spelling of 21952430 in words is "twenty-one million, nine hundred fifty-two thousand, four hundred thirty".