1121221220201 has 4 divisors (see below), whose sum is σ = 1139601896004. Its totient is φ = 1102840544400.

The previous prime is 1121221220137. The next prime is 1121221220219. The reversal of 1121221220201 is 1020221221211.

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 162586368400 + 958634851801 = 403220^2 + 979099^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121221220201 - 2⁶ = 1121221220137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121221220201.

It is not an unprimeable number, because it can be changed into a prime (1121221220281) 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, 9190337810 + ... + 9190337931.

It is an arithmetic number, because the mean of its divisors is an integer number (284900474001).

Almost surely, 2^{1121221220201} is an apocalyptic number.

It is an amenable number.

1121221220201 is a deficient number, since it is larger than the sum of its proper divisors (18380675803).

1121221220201 is an equidigital number, since it uses as much as digits as its factorization.

1121221220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18380675802.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1121221220201 its reverse (1020221221211), we get a palindrome (2141442441412).

The spelling of 1121221220201 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred one".