21213212330 has 8 divisors (see below), whose sum is σ = 38183782212. Its totient is φ = 8485284928.

The previous prime is 21213212329. The next prime is 21213212333. The reversal of 21213212330 is 3321231212.

21213212330 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 19166464249 + 2046748081 = 138443^2 + 45241^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21213212333) 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, 1060660607 + ... + 1060660626.

Almost surely, 2^21213212330 is an apocalyptic number.

21213212330 is a deficient number, since it is larger than the sum of its proper divisors (16970569882).

21213212330 is a wasteful number, since it uses less digits than its factorization.

21213212330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121321240.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21213212330 its reverse (3321231212), we get a palindrome (24534443542).

The spelling of 21213212330 in words is "twenty-one billion, two hundred thirteen million, two hundred twelve thousand, three hundred thirty".