21164230 has 8 divisors (see below), whose sum is σ = 38095632. Its totient is φ = 8465688.

The previous prime is 21164189. The next prime is 21164237. The reversal of 21164230 is 3246112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21164198 and 21164207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1058202 + ... + 1058221.

It is an arithmetic number, because the mean of its divisors is an integer number (4761954).

Almost surely, 2^21164230 is an apocalyptic number.

21164230 is a deficient number, since it is larger than the sum of its proper divisors (16931402).

21164230 is a wasteful number, since it uses less digits than its factorization.

21164230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116430.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21164230 is about 4600.4597596327. The cubic root of 21164230 is about 276.6097542650.

The spelling of 21164230 in words is "twenty-one million, one hundred sixty-four thousand, two hundred thirty".