21725033 has 8 divisors (see below), whose sum is σ = 23734080. Its totient is φ = 19721680.

The previous prime is 21725027. The next prime is 21725047. The reversal of 21725033 is 33052712.

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

It is not a de Polignac number, because 21725033 - 2¹⁶ = 21659497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21725003) 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, 12716 + ... + 14322.

It is an arithmetic number, because the mean of its divisors is an integer number (2966760).

Almost surely, 2^21725033 is an apocalyptic number.

It is an amenable number.

21725033 is a deficient number, since it is larger than the sum of its proper divisors (2009047).

21725033 is a wasteful number, since it uses less digits than its factorization.

21725033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 21725033 is about 4661.0120145737. The cubic root of 21725033 is about 279.0316592414.

Adding to 21725033 its reverse (33052712), we get a palindrome (54777745).

The spelling of 21725033 in words is "twenty-one million, seven hundred twenty-five thousand, thirty-three".