121221221222 has 16 divisors (see below), whose sum is σ = 182157405360. Its totient is φ = 60502167648.

The previous prime is 121221221183. The next prime is 121221221227. The reversal of 121221221222 is 222122122121.

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 = 121221221194 and 121221221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221221227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3174668 + ... + 3212624.

It is an arithmetic number, because the mean of its divisors is an integer number (11384837835).

Almost surely, 2^121221221222 is an apocalyptic number.

121221221222 is a deficient number, since it is larger than the sum of its proper divisors (60936184138).

121221221222 is a wasteful number, since it uses less digits than its factorization.

121221221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40775.

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

Adding to 121221221222 its reverse (222122122121), we get a palindrome (343343343343).

The spelling of 121221221222 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-two".