111221210212211 has 32 divisors (see below), whose sum is σ = 125407058768640. Its totient is φ = 97762340592000.

The previous prime is 111221210212051. The next prime is 111221210212247. The reversal of 111221210212211 is 112212012122111.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221210212211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111221210214211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253407596 + ... + 253846118.

It is an arithmetic number, because the mean of its divisors is an integer number (3918970586520).

Almost surely, 2^{111221210212211} is an apocalyptic number.

111221210212211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111221210212211 is a deficient number, since it is larger than the sum of its proper divisors (14185848556429).

111221210212211 is a wasteful number, since it uses less digits than its factorization.

111221210212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443987.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111221210212211 its reverse (112212012122111), we get a palindrome (223433222334322).

The spelling of 111221210212211 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, two hundred twelve thousand, two hundred eleven".