21211203321 has 64 divisors (see below), whose sum is σ = 39502233600. Its totient is φ = 11018676240.

The previous prime is 21211203319. The next prime is 21211203329. The reversal of 21211203321 is 12330211212.

21211203321 is a `hidden beast` number, since 212 + 1 + 120 + 332 + 1 = 666.

It is not a de Polignac number, because 21211203321 - 2¹ = 21211203319 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21211203294 and 21211203303.

It is not an unprimeable number, because it can be changed into a prime (21211203329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 209400 + ... + 293718.

It is an arithmetic number, because the mean of its divisors is an integer number (617222400).

Almost surely, 2^21211203321 is an apocalyptic number.

21211203321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21211203321 is a deficient number, since it is larger than the sum of its proper divisors (18291030279).

21211203321 is an equidigital number, since it uses as much as digits as its factorization.

21211203321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84368 (or 84340 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21211203321 its reverse (12330211212), we get a palindrome (33541414533).

The spelling of 21211203321 in words is "twenty-one billion, two hundred eleven million, two hundred three thousand, three hundred twenty-one".