21221213232330 has 24 divisors (see below), whose sum is σ = 55175154404292. Its totient is φ = 5658990195264.

The previous prime is 21221213232319. The next prime is 21221213232347. The reversal of 21221213232330 is 3323231212212.

21221213232330 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 1 + 2 + 1 + 323 + 2 + 330 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18542815862769 + 2678397369561 = 4306137^2 + 1636581^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21221213232294 and 21221213232303.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117895628979 + ... + 117895629158.

Almost surely, 2^{21221213232330} is an apocalyptic number.

21221213232330 is an abundant number, since it is smaller than the sum of its proper divisors (33953941171962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221213232330 is a wasteful number, since it uses less digits than its factorization.

21221213232330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235791258150 (or 235791258147 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21221213232330 its reverse (3323231212212), we get a palindrome (24544444444542).

The spelling of 21221213232330 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred thirteen million, two hundred thirty-two thousand, three hundred thirty".