221222122 has 24 divisors (see below), whose sum is σ = 386204868. Its totient is φ = 94638720.

The previous prime is 221222087. The next prime is 221222123.

221222122 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 207965241 + 13256881 = 14421^2 + 3641^2 .

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 221222096 and 221222105.

It is not an unprimeable number, because it can be changed into a prime (221222123) 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, 22773 + ... + 31000.

Almost surely, 2^221222122 is an apocalyptic number.

221222122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221222122 is a deficient number, since it is larger than the sum of its proper divisors (164982746).

221222122 is a wasteful number, since it uses less digits than its factorization.

221222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53814 (or 53803 counting only the distinct ones).

The product of its digits is 128, while the sum is 16.

The square root of 221222122 is about 14873.5376424037. The cubic root of 221222122 is about 604.7968463910.

The spelling of 221222122 in words is "two hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-two".