21201110201211 has 16 divisors (see below), whose sum is σ = 30963081837600. Its totient is φ = 12843945056768.

The previous prime is 21201110201209. The next prime is 21201110201233. The reversal of 21201110201211 is 11210201110212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21201110201211 - 2¹ = 21201110201209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201110201611) 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, 7167378576 + ... + 7167381533.

It is an arithmetic number, because the mean of its divisors is an integer number (1935192614850).

Almost surely, 2^{21201110201211} is an apocalyptic number.

21201110201211 is a deficient number, since it is larger than the sum of its proper divisors (9761971636389).

21201110201211 is a wasteful number, since it uses less digits than its factorization.

21201110201211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14334760158.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21201110201211 its reverse (11210201110212), we get a palindrome (32411311311423).

Subtracting from 21201110201211 its reverse (11210201110212), we obtain a palindrome (9990909090999).

The spelling of 21201110201211 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, two hundred one thousand, two hundred eleven".