21830826 has 32 divisors (see below), whose sum is σ = 44997120. Its totient is φ = 7057904.

The previous prime is 21830803. The next prime is 21830843. The reversal of 21830826 is 62803812.

It is a junction number, because it is equal to n+sod(n) for n = 21830793 and 21830802.

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, 29011 + ... + 29753.

It is an arithmetic number, because the mean of its divisors is an integer number (1406160).

Almost surely, 2^21830826 is an apocalyptic number.

21830826 is an abundant number, since it is smaller than the sum of its proper divisors (23166294).

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

21830826 is a wasteful number, since it uses less digits than its factorization.

21830826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 21830826 is about 4672.3469477341. The cubic root of 21830826 is about 279.4838535523.

The spelling of 21830826 in words is "twenty-one million, eight hundred thirty thousand, eight hundred twenty-six".