21232213321 has 16 divisors (see below), whose sum is σ = 23218790400. Its totient is φ = 19255107600.

The previous prime is 21232213273. The next prime is 21232213333. The reversal of 21232213321 is 12331223212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232213321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232213292 and 21232213301.

It is not an unprimeable number, because it can be changed into a prime (21232213351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14754120 + ... + 14755558.

It is an arithmetic number, because the mean of its divisors is an integer number (1451174400).

Almost surely, 2^21232213321 is an apocalyptic number.

It is an amenable number.

21232213321 is a deficient number, since it is larger than the sum of its proper divisors (1986577079).

21232213321 is a wasteful number, since it uses less digits than its factorization.

21232213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780.

The product of its digits is 864, while the sum is 22.

Adding to 21232213321 its reverse (12331223212), we get a palindrome (33563436533).

The spelling of 21232213321 in words is "twenty-one billion, two hundred thirty-two million, two hundred thirteen thousand, three hundred twenty-one".