21222830 has 32 divisors (see below), whose sum is σ = 40219200. Its totient is φ = 8052480.

The previous prime is 21222787. The next prime is 21222847. The reversal of 21222830 is 3822212.

It is a Curzon number.

It is a congruent number.

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, 14471 + ... + 15869.

It is an arithmetic number, because the mean of its divisors is an integer number (1256850).

Almost surely, 2^21222830 is an apocalyptic number.

21222830 is a deficient number, since it is larger than the sum of its proper divisors (18996370).

21222830 is a wasteful number, since it uses less digits than its factorization.

21222830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21222830 is about 4606.8242857743. The cubic root of 21222830 is about 276.8648134587.

The spelling of 21222830 in words is "twenty-one million, two hundred twenty-two thousand, eight hundred thirty".