21233133331 has 4 divisors (see below), whose sum is σ = 22482141192. Its totient is φ = 19984125472.

The previous prime is 21233133323. The next prime is 21233133373. The reversal of 21233133331 is 13333133212.

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

It is a cyclic number.

It is not a de Polignac number, because 21233133331 - 2³ = 21233133323 is a prime.

It is a super-2 number, since 2×21233133331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233133296 and 21233133305.

It is not an unprimeable number, because it can be changed into a prime (21233133301) 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, 624503905 + ... + 624503938.

It is an arithmetic number, because the mean of its divisors is an integer number (5620535298).

Almost surely, 2^21233133331 is an apocalyptic number.

21233133331 is a deficient number, since it is larger than the sum of its proper divisors (1249007861).

21233133331 is a wasteful number, since it uses less digits than its factorization.

21233133331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249007860.

The product of its digits is 2916, while the sum is 25.

Adding to 21233133331 its reverse (13333133212), we get a palindrome (34566266543).

The spelling of 21233133331 in words is "twenty-one billion, two hundred thirty-three million, one hundred thirty-three thousand, three hundred thirty-one".