21830316 has 24 divisors (see below), whose sum is σ = 53618880. Its totient is φ = 6893712.

The previous prime is 21830311. The next prime is 21830317. The reversal of 21830316 is 61303812.

It is not an unprimeable number, because it can be changed into a prime (21830311) 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, 47646 + ... + 48101.

It is an arithmetic number, because the mean of its divisors is an integer number (2234120).

Almost surely, 2^21830316 is an apocalyptic number.

It is an amenable number.

21830316 is an abundant number, since it is smaller than the sum of its proper divisors (31788564).

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

21830316 is a wasteful number, since it uses less digits than its factorization.

21830316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95773 (or 95771 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21830316 is about 4672.2923709888. The cubic root of 21830316 is about 279.4816771516.

The spelling of 21830316 in words is "twenty-one million, eight hundred thirty thousand, three hundred sixteen".