1221211122201 has 40 divisors (see below), whose sum is σ = 2085066703104. Its totient is φ = 697775627520.

The previous prime is 1221211122163. The next prime is 1221211122233. The reversal of 1221211122201 is 1022211121221.

1221211122201 is a `hidden beast` number, since 1 + 221 + 211 + 12 + 220 + 1 = 666.

It is not a de Polignac number, because 1221211122201 - 2¹⁰ = 1221211121177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221211122281) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7082256 + ... + 7252638.

Almost surely, 2^{1221211122201} is an apocalyptic number.

It is an amenable number.

1221211122201 is a deficient number, since it is larger than the sum of its proper divisors (863855580903).

1221211122201 is a wasteful number, since it uses less digits than its factorization.

1221211122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183043 (or 183034 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221211122201 its reverse (1022211121221), we get a palindrome (2243422243422).

The spelling of 1221211122201 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, two hundred one".