21700033 has 8 divisors (see below), whose sum is σ = 23630400. Its totient is φ = 19848528.

The previous prime is 21700001. The next prime is 21700039. The reversal of 21700033 is 33000712.

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

It is not a de Polignac number, because 21700033 - 2⁵ = 21700001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21700039) 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, 19141 + ... + 20242.

It is an arithmetic number, because the mean of its divisors is an integer number (2953800).

Almost surely, 2^21700033 is an apocalyptic number.

It is an amenable number.

21700033 is a deficient number, since it is larger than the sum of its proper divisors (1930367).

21700033 is a wasteful number, since it uses less digits than its factorization.

21700033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39431.

The product of its (nonzero) digits is 126, while the sum is 16.

The square root of 21700033 is about 4658.3294215845. The cubic root of 21700033 is about 278.9245866157.

Adding to 21700033 its reverse (33000712), we get a palindrome (54700745).

The spelling of 21700033 in words is "twenty-one million, seven hundred thousand, thirty-three".