211221212211 has 12 divisors (see below), whose sum is σ = 306694677120. Its totient is φ = 140076893520.

The previous prime is 211221212173. The next prime is 211221212219. The reversal of 211221212211 is 112212122112.

211221212211 is a `hidden beast` number, since 21 + 1 + 221 + 212 + 211 = 666.

It is not a de Polignac number, because 211221212211 - 2¹⁴ = 211221195827 is a prime.

It is a super-2 number, since 2×211221212211² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221212219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61435516 + ... + 61438953.

It is an arithmetic number, because the mean of its divisors is an integer number (25557889760).

Almost surely, 2^211221212211 is an apocalyptic number.

211221212211 is a deficient number, since it is larger than the sum of its proper divisors (95473464909).

211221212211 is a wasteful number, since it uses less digits than its factorization.

211221212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122874666 (or 122874663 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 211221212211 its reverse (112212122112), we get a palindrome (323433334323).

Subtracting from 211221212211 its reverse (112212122112), we obtain a palindrome (99009090099).

It can be divided in two parts, 2 and 11221212211, that multiplied together give a palindrome (22442424422).

The spelling of 211221212211 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, two hundred eleven".