21033164 has 24 divisors (see below), whose sum is σ = 37923648. Its totient is φ = 10200960.

The previous prime is 21033163. The next prime is 21033169. The reversal of 21033164 is 46133012.

It is not an unprimeable number, because it can be changed into a prime (21033161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45197 + ... + 45659.

It is an arithmetic number, because the mean of its divisors is an integer number (1580152).

Almost surely, 2^21033164 is an apocalyptic number.

It is an amenable number.

21033164 is a deficient number, since it is larger than the sum of its proper divisors (16890484).

21033164 is a wasteful number, since it uses less digits than its factorization.

21033164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21033164 is about 4586.1927565247. The cubic root of 21033164 is about 276.0375745245.

Adding to 21033164 its reverse (46133012), we get a palindrome (67166176).

The spelling of 21033164 in words is "twenty-one million, thirty-three thousand, one hundred sixty-four".