221211222122 has 32 divisors (see below), whose sum is σ = 367540891200. Its totient is φ = 99010926720.

The previous prime is 221211222013. The next prime is 221211222137. The reversal of 221211222122 is 221222112122.

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 = 221211222094 and 221211222103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 872129 + ... + 1096827.

It is an arithmetic number, because the mean of its divisors is an integer number (11485652850).

Almost surely, 2^221211222122 is an apocalyptic number.

221211222122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221211222122 is a deficient number, since it is larger than the sum of its proper divisors (146329669078).

221211222122 is a wasteful number, since it uses less digits than its factorization.

221211222122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225398.

The product of its digits is 256, while the sum is 20.

Adding to 221211222122 its reverse (221222112122), we get a palindrome (442433334244).

Subtracting 221211222122 from its reverse (221222112122), we obtain a square (10890000 = 3300²).

The spelling of 221211222122 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, one hundred twenty-two".