21233533273 has 4 divisors (see below), whose sum is σ = 22482564660. Its totient is φ = 19984501888.

The previous prime is 21233533271. The next prime is 21233533283. The reversal of 21233533273 is 37233533212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10981363264 + 10252170009 = 104792^2 + 101253^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233533273 - 2¹ = 21233533271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233533271) 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, 624515668 + ... + 624515701.

It is an arithmetic number, because the mean of its divisors is an integer number (5620641165).

Almost surely, 2^21233533273 is an apocalyptic number.

It is an amenable number.

21233533273 is a deficient number, since it is larger than the sum of its proper divisors (1249031387).

21233533273 is a wasteful number, since it uses less digits than its factorization.

21233533273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249031386.

The product of its digits is 68040, while the sum is 34.

The spelling of 21233533273 in words is "twenty-one billion, two hundred thirty-three million, five hundred thirty-three thousand, two hundred seventy-three".