21002023033 has 4 divisors (see below), whose sum is σ = 21002323300. Its totient is φ = 21001722768.

The previous prime is 21002023013. The next prime is 21002023061. The reversal of 21002023033 is 33032020012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10208475369 + 10793547664 = 101037^2 + 103892^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002023033 - 2⁵ = 21002023001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002022998 and 21002023016.

It is not an unprimeable number, because it can be changed into a prime (21002023013) 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, 16243 + ... + 205591.

It is an arithmetic number, because the mean of its divisors is an integer number (5250580825).

Almost surely, 2^21002023033 is an apocalyptic number.

It is an amenable number.

21002023033 is a deficient number, since it is larger than the sum of its proper divisors (300267).

21002023033 is a wasteful number, since it uses less digits than its factorization.

21002023033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300266.

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 21002023033 its reverse (33032020012), we get a palindrome (54034043045).

The spelling of 21002023033 in words is "twenty-one billion, two million, twenty-three thousand, thirty-three".