21223210211 has 24 divisors (see below), whose sum is σ = 25192797984. Its totient is φ = 17822851200.

The previous prime is 21223210201. The next prime is 21223210223. The reversal of 21223210211 is 11201232212.

It is a de Polignac number, because none of the positive numbers 2^k-21223210211 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 21223210211.

It is not an unprimeable number, because it can be changed into a prime (21223210201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 520481 + ... + 559773.

It is an arithmetic number, because the mean of its divisors is an integer number (1049699916).

Almost surely, 2^21223210211 is an apocalyptic number.

21223210211 is a deficient number, since it is larger than the sum of its proper divisors (3969587773).

21223210211 is a wasteful number, since it uses less digits than its factorization.

21223210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39531 (or 39524 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21223210211 its reverse (11201232212), we get a palindrome (32424442423).

The spelling of 21223210211 in words is "twenty-one billion, two hundred twenty-three million, two hundred ten thousand, two hundred eleven".