21235343333 has 4 divisors (see below), whose sum is σ = 21236537280. Its totient is φ = 21234149388.

The previous prime is 21235343309. The next prime is 21235343401. The reversal of 21235343333 is 33334353212.

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 21235343333 - 2²² = 21231149029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21235343333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235343533) 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, 569885 + ... + 606002.

It is an arithmetic number, because the mean of its divisors is an integer number (5309134320).

Almost surely, 2^21235343333 is an apocalyptic number.

It is an amenable number.

21235343333 is a deficient number, since it is larger than the sum of its proper divisors (1193947).

21235343333 is a wasteful number, since it uses less digits than its factorization.

21235343333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193946.

The product of its digits is 58320, while the sum is 32.

Adding to 21235343333 its reverse (33334353212), we get a palindrome (54569696545).

The spelling of 21235343333 in words is "twenty-one billion, two hundred thirty-five million, three hundred forty-three thousand, three hundred thirty-three".