1221001101101 has 4 divisors (see below), whose sum is σ = 1250781615804. Its totient is φ = 1191220586400.

The previous prime is 1221001101053. The next prime is 1221001101107. The reversal of 1221001101101 is 1011011001221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32094364201 + 1188906736900 = 179149^2 + 1090370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221001101101 - 2¹⁸ = 1221000838957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221001101107) 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, 14890257290 + ... + 14890257371.

It is an arithmetic number, because the mean of its divisors is an integer number (312695403951).

Almost surely, 2^{1221001101101} is an apocalyptic number.

It is an amenable number.

1221001101101 is a deficient number, since it is larger than the sum of its proper divisors (29780514703).

1221001101101 is an equidigital number, since it uses as much as digits as its factorization.

1221001101101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29780514702.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1221001101101 its reverse (1011011001221), we get a palindrome (2232012102322).

The spelling of 1221001101101 in words is "one trillion, two hundred twenty-one billion, one million, one hundred one thousand, one hundred one".