1221200022201 has 32 divisors (see below), whose sum is σ = 1742966860800. Its totient is φ = 758278635840.

The previous prime is 1221200022187. The next prime is 1221200022221. The reversal of 1221200022201 is 1022200021221.

It is not a de Polignac number, because 1221200022201 - 2⁹ = 1221200021689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221200022221) 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 31 ways as a sum of consecutive naturals, for example, 1629756 + ... + 2257986.

It is an arithmetic number, because the mean of its divisors is an integer number (54467714400).

Almost surely, 2^{1221200022201} is an apocalyptic number.

It is an amenable number.

1221200022201 is a deficient number, since it is larger than the sum of its proper divisors (521766838599).

1221200022201 is a wasteful number, since it uses less digits than its factorization.

1221200022201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628829.

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

Adding to 1221200022201 its reverse (1022200021221), we get a palindrome (2243400043422).

The spelling of 1221200022201 in words is "one trillion, two hundred twenty-one billion, two hundred million, twenty-two thousand, two hundred one".