21330333231 has 8 divisors (see below), whose sum is σ = 28648039344. Its totient is φ = 14116424640.

The previous prime is 21330333229. The next prime is 21330333281. The reversal of 21330333231 is 13233303312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21330333231 - 2¹ = 21330333229 is a prime.

It is a super-2 number, since 2×21330333231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330333281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25948900 + ... + 25949721.

It is an arithmetic number, because the mean of its divisors is an integer number (3581004918).

Almost surely, 2^21330333231 is an apocalyptic number.

21330333231 is a deficient number, since it is larger than the sum of its proper divisors (7317706113).

21330333231 is a wasteful number, since it uses less digits than its factorization.

21330333231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51898761.

The product of its (nonzero) digits is 2916, while the sum is 24.

Adding to 21330333231 its reverse (13233303312), we get a palindrome (34563636543).

The spelling of 21330333231 in words is "twenty-one billion, three hundred thirty million, three hundred thirty-three thousand, two hundred thirty-one".