21168230 has 32 divisors (see below), whose sum is σ = 40590720. Its totient is φ = 7920640.

The previous prime is 21168229. The next prime is 21168239. The reversal of 21168230 is 3286112.

It is a super-2 number, since 2×21168230² = 896187922665800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21168196 and 21168205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21168239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40370 + ... + 40890.

It is an arithmetic number, because the mean of its divisors is an integer number (1268460).

Almost surely, 2^21168230 is an apocalyptic number.

21168230 is a deficient number, since it is larger than the sum of its proper divisors (19422490).

21168230 is a wasteful number, since it uses less digits than its factorization.

21168230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21168230 is about 4600.8944782509. The cubic root of 21168230 is about 276.6271794099.

The spelling of 21168230 in words is "twenty-one million, one hundred sixty-eight thousand, two hundred thirty".