21449230 has 32 divisors (see below), whose sum is σ = 42353280. Its totient is φ = 7756320.

The previous prime is 21449227. The next prime is 21449231. The reversal of 21449230 is 3294412.

It is a junction number, because it is equal to n+sod(n) for n = 21449195 and 21449204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21449231) by changing a digit.

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, 24541 + ... + 25399.

It is an arithmetic number, because the mean of its divisors is an integer number (1323540).

Almost surely, 2^21449230 is an apocalyptic number.

21449230 is a deficient number, since it is larger than the sum of its proper divisors (20904050).

21449230 is a wasteful number, since it uses less digits than its factorization.

21449230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21449230 is about 4631.3313420657. The cubic root of 21449230 is about 277.8458421059.

The spelling of 21449230 in words is "twenty-one million, four hundred forty-nine thousand, two hundred thirty".