21102230 has 8 divisors (see below), whose sum is σ = 37984032. Its totient is φ = 8440888.

The previous prime is 21102209. The next prime is 21102239. The reversal of 21102230 is 3220112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21102230² = 890608221945800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055102 + ... + 1055121.

It is an arithmetic number, because the mean of its divisors is an integer number (4748004).

Almost surely, 2^21102230 is an apocalyptic number.

21102230 is a deficient number, since it is larger than the sum of its proper divisors (16881802).

21102230 is a wasteful number, since it uses less digits than its factorization.

21102230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110230.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21102230 is about 4593.7163604210. The cubic root of 21102230 is about 276.3393833185.

Adding to 21102230 its reverse (3220112), we get a palindrome (24322342).

The spelling of 21102230 in words is "twenty-one million, one hundred two thousand, two hundred thirty".