21164033 has 4 divisors (see below), whose sum is σ = 23088048. Its totient is φ = 19240020.

The previous prime is 21164029. The next prime is 21164047. The reversal of 21164033 is 33046112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21164033 - 2² = 21164029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21163996 and 21164014.

It is not an unprimeable number, because it can be changed into a prime (21164063) 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, 961991 + ... + 962012.

It is an arithmetic number, because the mean of its divisors is an integer number (5772012).

Almost surely, 2^21164033 is an apocalyptic number.

It is an amenable number.

21164033 is a deficient number, since it is larger than the sum of its proper divisors (1924015).

21164033 is a wasteful number, since it uses less digits than its factorization.

21164033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924014.

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

The square root of 21164033 is about 4600.4383486794. The cubic root of 21164033 is about 276.6088960199.

The spelling of 21164033 in words is "twenty-one million, one hundred sixty-four thousand, thirty-three".