121221012222 has 12 divisors (see below), whose sum is σ = 262645526520. Its totient is φ = 40407004068.

The previous prime is 121221012217. The next prime is 121221012233. The reversal of 121221012222 is 222210122121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 6734500679 = 121221012222 / (1 + 2 + 1 + 2 + 2 + 1 + 0 + 1 + 2 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 121221012195 and 121221012204.

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 5 ways as a sum of consecutive naturals, for example, 3367250322 + ... + 3367250357.

It is an arithmetic number, because the mean of its divisors is an integer number (21887127210).

Almost surely, 2^121221012222 is an apocalyptic number.

121221012222 is an abundant number, since it is smaller than the sum of its proper divisors (141424514298).

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

121221012222 is a wasteful number, since it uses less digits than its factorization.

121221012222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6734500687 (or 6734500684 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121221012222 its reverse (222210122121), we get a palindrome (343431134343).

The spelling of 121221012222 in words is "one hundred twenty-one billion, two hundred twenty-one million, twelve thousand, two hundred twenty-two".