21320332211 has 4 divisors (see below), whose sum is σ = 21320957112. Its totient is φ = 21319707312.

The previous prime is 21320332177. The next prime is 21320332237. The reversal of 21320332211 is 11223302312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21320332211 - 2⁶ = 21320332147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320332261) 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, 258125 + ... + 330558.

It is an arithmetic number, because the mean of its divisors is an integer number (5330239278).

Almost surely, 2^21320332211 is an apocalyptic number.

21320332211 is a deficient number, since it is larger than the sum of its proper divisors (624901).

21320332211 is an equidigital number, since it uses as much as digits as its factorization.

21320332211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624900.

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

Adding to 21320332211 its reverse (11223302312), we get a palindrome (32543634523).

The spelling of 21320332211 in words is "twenty-one billion, three hundred twenty million, three hundred thirty-two thousand, two hundred eleven".