21233164 has 6 divisors (see below), whose sum is σ = 37158044. Its totient is φ = 10616580.

The previous prime is 21233161. The next prime is 21233183. The reversal of 21233164 is 46133212.

It is not an unprimeable number, because it can be changed into a prime (21233161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2654142 + ... + 2654149.

Almost surely, 2^21233164 is an apocalyptic number.

It is an amenable number.

21233164 is a deficient number, since it is larger than the sum of its proper divisors (15924880).

21233164 is a wasteful number, since it uses less digits than its factorization.

21233164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5308295 (or 5308293 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 21233164 is about 4607.9457462084. The cubic root of 21233164 is about 276.9097439529.

Adding to 21233164 its reverse (46133212), we get a palindrome (67366376).

The spelling of 21233164 in words is "twenty-one million, two hundred thirty-three thousand, one hundred sixty-four".