221220121222 has 8 divisors (see below), whose sum is σ = 331833902472. Its totient is φ = 110608820400.

The previous prime is 221220121211. The next prime is 221220121223. The reversal of 221220121222 is 222121022122.

221220121222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221220121222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220121223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378279 + ... + 765202.

It is an arithmetic number, because the mean of its divisors is an integer number (41479237809).

Almost surely, 2^221220121222 is an apocalyptic number.

221220121222 is a deficient number, since it is larger than the sum of its proper divisors (110613781250).

221220121222 is a wasteful number, since it uses less digits than its factorization.

221220121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240214.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221220121222 its reverse (222121022122), we get a palindrome (443341143344).

The spelling of 221220121222 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-two".