21832770 has 16 divisors (see below), whose sum is σ = 52398720. Its totient is φ = 5822064.

The previous prime is 21832757. The next prime is 21832771. The reversal of 21832770 is 7723812.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 727759 = 21832770 / (2 + 1 + 8 + 3 + 2 + 7 + 7 + 0).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21832771) 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, 363850 + ... + 363909.

It is an arithmetic number, because the mean of its divisors is an integer number (3274920).

Almost surely, 2^21832770 is an apocalyptic number.

21832770 is an abundant number, since it is smaller than the sum of its proper divisors (30565950).

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

21832770 is a wasteful number, since it uses less digits than its factorization.

21832770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727769.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 21832770 is about 4672.5549755995. The cubic root of 21832770 is about 279.4921491688.

The spelling of 21832770 in words is "twenty-one million, eight hundred thirty-two thousand, seven hundred seventy".