221221101211222 has 64 divisors (see below), whose sum is σ = 405850000343040. Its totient is φ = 88376138684064.

The previous prime is 221221101211211. The next prime is 221221101211247. The reversal of 221221101211222 is 222112101122122.

It is a super-2 number, since 2×221221101211222² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221221101211193 and 221221101211202.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 12118938 + ... + 24275725.

It is an arithmetic number, because the mean of its divisors is an integer number (6341406255360).

Almost surely, 2^{221221101211222} is an apocalyptic number.

221221101211222 is a deficient number, since it is larger than the sum of its proper divisors (184628899131818).

221221101211222 is a wasteful number, since it uses less digits than its factorization.

221221101211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36395177.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221221101211222 its reverse (222112101122122), we get a palindrome (443333202333344).

It can be divided in two parts, 22122110 and 1211222, that added together give a palindrome (23333332).

The spelling of 221221101211222 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred eleven thousand, two hundred twenty-two".