1221200222116 has 48 divisors (see below), whose sum is σ = 2465477917056. Its totient is φ = 518427350784.

The previous prime is 1221200222101. The next prime is 1221200222117. The reversal of 1221200222116 is 6112220021221.

It is not an unprimeable number, because it can be changed into a prime (1221200222117) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 47554656 + ... + 47580328.

It is an arithmetic number, because the mean of its divisors is an integer number (51364123272).

Almost surely, 2^{1221200222116} is an apocalyptic number.

It is an amenable number.

1221200222116 is an abundant number, since it is smaller than the sum of its proper divisors (1244277694940).

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

1221200222116 is a wasteful number, since it uses less digits than its factorization.

1221200222116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41668 (or 41666 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 1221200222116 its reverse (6112220021221), we get a palindrome (7333420243337).

The spelling of 1221200222116 in words is "one trillion, two hundred twenty-one billion, two hundred million, two hundred twenty-two thousand, one hundred sixteen".