21324320211 has 32 divisors (see below), whose sum is σ = 30464501760. Its totient is φ = 13234918400.

The previous prime is 21324320197. The next prime is 21324320221. The reversal of 21324320211 is 11202342312.

It is a cyclic number.

It is not a de Polignac number, because 21324320211 - 2¹⁵ = 21324287443 is a prime.

It is a super-2 number, since 2×21324320211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21324320221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1210555 + ... + 1228043.

It is an arithmetic number, because the mean of its divisors is an integer number (952015680).

Almost surely, 2^21324320211 is an apocalyptic number.

21324320211 is a deficient number, since it is larger than the sum of its proper divisors (9140181549).

21324320211 is a wasteful number, since it uses less digits than its factorization.

21324320211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17987.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21324320211 its reverse (11202342312), we get a palindrome (32526662523).

The spelling of 21324320211 in words is "twenty-one billion, three hundred twenty-four million, three hundred twenty thousand, two hundred eleven".