21252410333 has 16 divisors (see below), whose sum is σ = 26869708800. Its totient is φ = 16327071600.

The previous prime is 21252410329. The next prime is 21252410339. The reversal of 21252410333 is 33301425212.

It is a happy number.

It is not a de Polignac number, because 21252410333 - 2² = 21252410329 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252410339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1938233 + ... + 1949166.

It is an arithmetic number, because the mean of its divisors is an integer number (1679356800).

Almost surely, 2^21252410333 is an apocalyptic number.

It is an amenable number.

21252410333 is a deficient number, since it is larger than the sum of its proper divisors (5617298467).

21252410333 is a wasteful number, since it uses less digits than its factorization.

21252410333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887488.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21252410333 its reverse (33301425212), we get a palindrome (54553835545).

The spelling of 21252410333 in words is "twenty-one billion, two hundred fifty-two million, four hundred ten thousand, three hundred thirty-three".