21994230 has 16 divisors (see below), whose sum is σ = 52786224. Its totient is φ = 5865120.

The previous prime is 21994213. The next prime is 21994237. The reversal of 21994230 is 3249912.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 733141 = 21994230 / (2 + 1 + 9 + 9 + 4 + 2 + 3 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21994237) 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, 366541 + ... + 366600.

It is an arithmetic number, because the mean of its divisors is an integer number (3299139).

Almost surely, 2^21994230 is an apocalyptic number.

21994230 is an abundant number, since it is smaller than the sum of its proper divisors (30791994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21994230 is a wasteful number, since it uses less digits than its factorization.

21994230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733151.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 21994230 is about 4689.8006354215. The cubic root of 21994230 is about 280.1794343071.

It can be divided in two parts, 219 and 94230, that added together give a palindrome (94449).

The spelling of 21994230 in words is "twenty-one million, nine hundred ninety-four thousand, two hundred thirty".