21022230 has 32 divisors (see below), whose sum is σ = 52648704. Its totient is φ = 5362016.

The previous prime is 21022223. The next prime is 21022249. The reversal of 21022230 is 3222012.

21022230 = 2291² + 2292² + ... + 2294².

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, 14544 + ... + 15923.

It is an arithmetic number, because the mean of its divisors is an integer number (1645272).

Almost surely, 2^21022230 is an apocalyptic number.

21022230 is an abundant number, since it is smaller than the sum of its proper divisors (31626474).

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

21022230 is a wasteful number, since it uses less digits than its factorization.

21022230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30500.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21022230 is about 4585.0005452562. Note that the first 3 decimals coincide. The cubic root of 21022230 is about 275.9897339177.

Adding to 21022230 its reverse (3222012), we get a palindrome (24244242).

The spelling of 21022230 in words is "twenty-one million, twenty-two thousand, two hundred thirty".