121222221112 has 8 divisors (see below), whose sum is σ = 227291664600. Its totient is φ = 60611110552.

The previous prime is 121222221097. The next prime is 121222221137. The reversal of 121222221112 is 211122222121.

It is a tau number, because it is divible by the number of its divisors (8).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 121222221112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7576388812 + ... + 7576388827.

It is an arithmetic number, because the mean of its divisors is an integer number (28411458075).

Almost surely, 2^121222221112 is an apocalyptic number.

It is an amenable number.

121222221112 is a deficient number, since it is larger than the sum of its proper divisors (106069443488).

121222221112 is a wasteful number, since it uses less digits than its factorization.

121222221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15152777645 (or 15152777641 counting only the distinct ones).

The product of its digits is 128, while the sum is 19.

Adding to 121222221112 its reverse (211122222121), we get a palindrome (332344443233).

The spelling of 121222221112 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred twelve".