21023033 has 8 divisors (see below), whose sum is σ = 22680648. Its totient is φ = 19412224.

The previous prime is 21023017. The next prime is 21023047. The reversal of 21023033 is 33032012.

It can be written as a sum of positive squares in 4 ways, for example, as 2601769 + 18421264 = 1613^2 + 4292^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21023033 - 2⁴ = 21023017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022999 and 21023017.

It is not an unprimeable number, because it can be changed into a prime (21023003) 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, 10766 + ... + 12567.

It is an arithmetic number, because the mean of its divisors is an integer number (2835081).

Almost surely, 2^21023033 is an apocalyptic number.

It is an amenable number.

21023033 is a deficient number, since it is larger than the sum of its proper divisors (1657615).

21023033 is a wasteful number, since it uses less digits than its factorization.

21023033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23403.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 21023033 is about 4585.0881125666. The cubic root of 21023033 is about 275.9932479270.

Adding to 21023033 its reverse (33032012), we get a palindrome (54055045).

The spelling of 21023033 in words is "twenty-one million, twenty-three thousand, thirty-three".