21403220333 has 4 divisors (see below), whose sum is σ = 23348967648. Its totient is φ = 19457473020.

The previous prime is 21403220273. The next prime is 21403220387. The reversal of 21403220333 is 33302230412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21403220333 - 2²⁶ = 21336111469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21403220299 and 21403220308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403220933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 972873641 + ... + 972873662.

It is an arithmetic number, because the mean of its divisors is an integer number (5837241912).

Almost surely, 2^21403220333 is an apocalyptic number.

It is an amenable number.

21403220333 is a deficient number, since it is larger than the sum of its proper divisors (1945747315).

21403220333 is a wasteful number, since it uses less digits than its factorization.

21403220333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945747314.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21403220333 its reverse (33302230412), we get a palindrome (54705450745).

The spelling of 21403220333 in words is "twenty-one billion, four hundred three million, two hundred twenty thousand, three hundred thirty-three".