1221200012122 has 16 divisors (see below), whose sum is σ = 1854249768000. Its totient is φ = 603160905600.

The previous prime is 1221200012119. The next prime is 1221200012143. The reversal of 1221200012122 is 2212100021221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221200012096 and 1221200012105.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10981879 + ... + 11092522.

It is an arithmetic number, because the mean of its divisors is an integer number (115890610500).

Almost surely, 2^{1221200012122} is an apocalyptic number.

1221200012122 is a deficient number, since it is larger than the sum of its proper divisors (633049755878).

1221200012122 is a wasteful number, since it uses less digits than its factorization.

1221200012122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22074741.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221200012122 its reverse (2212100021221), we get a palindrome (3433300033343).

Subtracting 1221200012122 from its reverse (2212100021221), we obtain a palindrome (990900009099).

The spelling of 1221200012122 in words is "one trillion, two hundred twenty-one billion, two hundred million, twelve thousand, one hundred twenty-two".