1221101200101 has 4 divisors (see below), whose sum is σ = 1628134933472. Its totient is φ = 814067466732.

The previous prime is 1221101200091. The next prime is 1221101200127. The reversal of 1221101200101 is 1010021011221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1221101200101 - 2⁶ = 1221101200037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221101208101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203516866681 + ... + 203516866686.

It is an arithmetic number, because the mean of its divisors is an integer number (407033733368).

Almost surely, 2^{1221101200101} is an apocalyptic number.

It is an amenable number.

1221101200101 is a deficient number, since it is larger than the sum of its proper divisors (407033733371).

1221101200101 is an equidigital number, since it uses as much as digits as its factorization.

1221101200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407033733370.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221101200101 its reverse (1010021011221), we get a palindrome (2231122211322).

The spelling of 1221101200101 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred thousand, one hundred one".