21211121222211 has 16 divisors (see below), whose sum is σ = 29788180531200. Its totient is φ = 13388313989088.

The previous prime is 21211121222209. The next prime is 21211121222219. The reversal of 21211121222211 is 11222212111212.

It is not a de Polignac number, because 21211121222211 - 2¹ = 21211121222209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211121222219) 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, 113567331 + ... + 113753948.

It is an arithmetic number, because the mean of its divisors is an integer number (1861761283200).

Almost surely, 2^{21211121222211} is an apocalyptic number.

21211121222211 is a deficient number, since it is larger than the sum of its proper divisors (8577059308989).

21211121222211 is a wasteful number, since it uses less digits than its factorization.

21211121222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227322938.

The product of its digits is 128, while the sum is 21.

Adding to 21211121222211 its reverse (11222212111212), we get a palindrome (32433333333423).

The spelling of 21211121222211 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".