21824930 has 32 divisors (see below), whose sum is σ = 42329088. Its totient is φ = 8078400.

The previous prime is 21824921. The next prime is 21824941. The reversal of 21824930 is 3942812.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21824893 and 21824902.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5600 + ... + 8660.

It is an arithmetic number, because the mean of its divisors is an integer number (1322784).

Almost surely, 2^21824930 is an apocalyptic number.

21824930 is a deficient number, since it is larger than the sum of its proper divisors (20504158).

21824930 is a wasteful number, since it uses less digits than its factorization.

21824930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 21824930 is about 4671.7159588314. The cubic root of 21824930 is about 279.4586905836.

The spelling of 21824930 in words is "twenty-one million, eight hundred twenty-four thousand, nine hundred thirty".