221111111112210 has 48 divisors (see below), whose sum is σ = 627151515157440. Its totient is φ = 53602693602720.

The previous prime is 221111111112193. The next prime is 221111111112211. The reversal of 221111111112210 is 12211111111122.

221111111112210 is a `hidden beast` number, since 221 + 1 + 1 + 111 + 111 + 221 + 0 = 666.

It is a super-2 number, since 2×221111111112210² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221111111112211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111672277350 + ... + 111672279329.

It is an arithmetic number, because the mean of its divisors is an integer number (13065656565780).

Almost surely, 2^{221111111112210} is an apocalyptic number.

221111111112210 is an abundant number, since it is smaller than the sum of its proper divisors (406040404045230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221111111112210 is a wasteful number, since it uses less digits than its factorization.

221111111112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223344556703 (or 223344556700 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 221111111112210 its reverse (12211111111122), we get a palindrome (233322222223332).

The spelling of 221111111112210 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred eleven million, one hundred twelve thousand, two hundred ten".