21201320211 has 16 divisors (see below), whose sum is σ = 30661309728. Its totient is φ = 12978329600.

The previous prime is 21201320207. The next prime is 21201320233. The reversal of 21201320211 is 11202310212.

It is a cyclic number.

It is not a de Polignac number, because 21201320211 - 2² = 21201320207 is a prime.

It is a super-3 number, since 3×21201320211³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201320201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5067570 + ... + 5071751.

It is an arithmetic number, because the mean of its divisors is an integer number (1916331858).

Almost surely, 2^21201320211 is an apocalyptic number.

21201320211 is a deficient number, since it is larger than the sum of its proper divisors (9459989517).

21201320211 is a wasteful number, since it uses less digits than its factorization.

21201320211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10139382.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21201320211 its reverse (11202310212), we get a palindrome (32403630423).

Subtracting from 21201320211 its reverse (11202310212), we obtain a palindrome (9999009999).

The spelling of 21201320211 in words is "twenty-one billion, two hundred one million, three hundred twenty thousand, two hundred eleven".