21201201211 has 8 divisors (see below), whose sum is σ = 23424345504. Its totient is φ = 19086503040.

The previous prime is 21201201199. The next prime is 21201201221. The reversal of 21201201211 is 11210210212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21201201211 - 2⁵ = 21201201179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201201191 and 21201201200.

It is not an unprimeable number, because it can be changed into a prime (21201201221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27111120 + ... + 27111901.

It is an arithmetic number, because the mean of its divisors is an integer number (2928043188).

Almost surely, 2^21201201211 is an apocalyptic number.

21201201211 is a deficient number, since it is larger than the sum of its proper divisors (2223144293).

21201201211 is a wasteful number, since it uses less digits than its factorization.

21201201211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54223061.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201201211 its reverse (11210210212), we get a palindrome (32411411423).

Subtracting from 21201201211 its reverse (11210210212), we obtain a palindrome (9990990999).

The spelling of 21201201211 in words is "twenty-one billion, two hundred one million, two hundred one thousand, two hundred eleven".