221112222210 has 48 divisors (see below), whose sum is σ = 627154669440. Its totient is φ = 53602962720.

The previous prime is 221112222209. The next prime is 221112222211. The reversal of 221112222210 is 12222211122.

It is a happy number.

221112222210 is a `hidden beast` number, since 221 + 1 + 1 + 222 + 221 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (221112222209) and next prime (221112222211).

It is a super-2 number, since 2×221112222210² (a number of 23 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 (221112222211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111671850 + ... + 111673829.

It is an arithmetic number, because the mean of its divisors is an integer number (13065722280).

Almost surely, 2^221112222210 is an apocalyptic number.

221112222210 is an abundant number, since it is smaller than the sum of its proper divisors (406042447230).

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

221112222210 is a wasteful number, since it uses less digits than its factorization.

221112222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223345703 (or 223345700 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221112222210 its reverse (12222211122), we get a palindrome (233334433332).

The spelling of 221112222210 in words is "two hundred twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, two hundred ten".