21304003211 has 4 divisors (see below), whose sum is σ = 21306757392. Its totient is φ = 21301249032.

The previous prime is 21304003187. The next prime is 21304003223. The reversal of 21304003211 is 11230040312.

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 21304003211 - 2¹⁴ = 21303986827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21304003211.

It is not an unprimeable number, because it can be changed into a prime (21304003261) 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, 1365455 + ... + 1380968.

It is an arithmetic number, because the mean of its divisors is an integer number (5326689348).

Almost surely, 2^21304003211 is an apocalyptic number.

21304003211 is a deficient number, since it is larger than the sum of its proper divisors (2754181).

21304003211 is an equidigital number, since it uses as much as digits as its factorization.

21304003211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754180.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21304003211 its reverse (11230040312), we get a palindrome (32534043523).

The spelling of 21304003211 in words is "twenty-one billion, three hundred four million, three thousand, two hundred eleven".