21213320211 has 6 divisors (see below), whose sum is σ = 30641462540. Its totient is φ = 14142213468.

The previous prime is 21213320209. The next prime is 21213320221. The reversal of 21213320211 is 11202331212.

21213320211 is a `hidden beast` number, since 2 + 121 + 332 + 0 + 211 = 666.

It is not a de Polignac number, because 21213320211 - 2¹ = 21213320209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213320221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178517781 + ... + 1178517798.

Almost surely, 2^21213320211 is an apocalyptic number.

21213320211 is a deficient number, since it is larger than the sum of its proper divisors (9428142329).

21213320211 is a wasteful number, since it uses less digits than its factorization.

21213320211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357035585 (or 2357035582 counting only the distinct ones).

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

Adding to 21213320211 its reverse (11202331212), we get a palindrome (32415651423).

The spelling of 21213320211 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty thousand, two hundred eleven".