21213003321 has 12 divisors (see below), whose sum is σ = 32253689520. Its totient is φ = 13397686200.

The previous prime is 21213003319. The next prime is 21213003323. The reversal of 21213003321 is 12330031212.

21213003321 is a `hidden beast` number, since 21 + 21 + 300 + 3 + 321 = 666.

It is an interprime number because it is at equal distance from previous prime (21213003319) and next prime (21213003323).

It is not a de Polignac number, because 21213003321 - 2¹ = 21213003319 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21213003294 and 21213003303.

It is not an unprimeable number, because it can be changed into a prime (21213003323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62026155 + ... + 62026496.

It is an arithmetic number, because the mean of its divisors is an integer number (2687807460).

Almost surely, 2^21213003321 is an apocalyptic number.

It is an amenable number.

21213003321 is a deficient number, since it is larger than the sum of its proper divisors (11040686199).

21213003321 is a wasteful number, since it uses less digits than its factorization.

21213003321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124052676 (or 124052673 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21213003321 its reverse (12330031212), we get a palindrome (33543034533).

The spelling of 21213003321 in words is "twenty-one billion, two hundred thirteen million, three thousand, three hundred twenty-one".