21319230 has 16 divisors (see below), whose sum is σ = 51166224. Its totient is φ = 5685120.

The previous prime is 21319223. The next prime is 21319261. The reversal of 21319230 is 3291312.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21319197 and 21319206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355291 + ... + 355350.

It is an arithmetic number, because the mean of its divisors is an integer number (3197889).

Almost surely, 2^21319230 is an apocalyptic number.

21319230 is an abundant number, since it is smaller than the sum of its proper divisors (29846994).

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

21319230 is a wasteful number, since it uses less digits than its factorization.

21319230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710651.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21319230 is about 4617.2751704875. The cubic root of 21319230 is about 277.2833793600.

The spelling of 21319230 in words is "twenty-one million, three hundred nineteen thousand, two hundred thirty".