1221222000012 has 48 divisors (see below), whose sum is σ = 3448156239360. Its totient is φ = 328395831552.

The previous prime is 1221222000001. The next prime is 1221222000041. The reversal of 1221222000012 is 2100002221221.

It is a junction number, because it is equal to n+sod(n) for n = 1221221999955 and 1221222000000.

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 in 15 ways as a sum of consecutive naturals, for example, 427597312 + ... + 427600167.

It is an arithmetic number, because the mean of its divisors is an integer number (71836588320).

Almost surely, 2^{1221222000012} is an apocalyptic number.

1221222000012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221222000012 is an abundant number, since it is smaller than the sum of its proper divisors (2226934239348).

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

1221222000012 is a wasteful number, since it uses less digits than its factorization.

1221222000012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855197510 (or 855197508 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1221222000012 its reverse (2100002221221), we get a palindrome (3321224221233).

The spelling of 1221222000012 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, twelve", and thus it is an aban number.