221111010211 has 16 divisors (see below), whose sum is σ = 274778742784. Its totient is φ = 173246472864.

The previous prime is 221111010203. The next prime is 221111010233. The reversal of 221111010211 is 112010111122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221111010211 - 2³ = 221111010203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 221111010191 and 221111010200.

It is not an unprimeable number, because it can be changed into a prime (221111010271) 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, 11785731 + ... + 11804476.

It is an arithmetic number, because the mean of its divisors is an integer number (17173671424).

Almost surely, 2^221111010211 is an apocalyptic number.

221111010211 is a deficient number, since it is larger than the sum of its proper divisors (53667732573).

221111010211 is a wasteful number, since it uses less digits than its factorization.

221111010211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23590330.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221111010211 its reverse (112010111122), we get a palindrome (333121121333).

The spelling of 221111010211 in words is "two hundred twenty-one billion, one hundred eleven million, ten thousand, two hundred eleven".