221220212121222 has 32 divisors (see below), whose sum is σ = 444821624661120. Its totient is φ = 73343356485120.

The previous prime is 221220212121191. The next prime is 221220212121239. The reversal of 221220212121222 is 222121212022122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221220212121192 and 221220212121201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13258972 + ... + 24864447.

It is an arithmetic number, because the mean of its divisors is an integer number (13900675770660).

Almost surely, 2^{221220212121222} is an apocalyptic number.

221220212121222 is an abundant number, since it is smaller than the sum of its proper divisors (223601412539898).

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

221220212121222 is a wasteful number, since it uses less digits than its factorization.

221220212121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38128628.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 221220212121222 its reverse (222121212022122), we get a palindrome (443341424143344).

The spelling of 221220212121222 in words is "two hundred twenty-one trillion, two hundred twenty billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-two".