1221100120101 has 8 divisors (see below), whose sum is σ = 1628356341024. Its totient is φ = 813955322960.

The previous prime is 1221100120091. The next prime is 1221100120103. The reversal of 1221100120101 is 1010210011221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221100120101 - 2⁵ = 1221100120069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100120103) 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 7 ways as a sum of consecutive naturals, for example, 27830370 + ... + 27874211.

It is an arithmetic number, because the mean of its divisors is an integer number (203544542628).

Almost surely, 2^{1221100120101} is an apocalyptic number.

It is an amenable number.

1221100120101 is a deficient number, since it is larger than the sum of its proper divisors (407256220923).

1221100120101 is an equidigital number, since it uses as much as digits as its factorization.

1221100120101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55711891.

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

Adding to 1221100120101 its reverse (1010210011221), we get a palindrome (2231310131322).

The spelling of 1221100120101 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty thousand, one hundred one".