1101201221221 has 4 divisors (see below), whose sum is σ = 1101436877772. Its totient is φ = 1100965564672.

The previous prime is 1101201221207. The next prime is 1101201221243. The reversal of 1101201221221 is 1221221021011.

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 588887412100 + 512313809121 = 767390^2 + 715761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101201221221 - 2¹³ = 1101201213029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101201221195 and 1101201221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101201221521) 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, 117821266 + ... + 117830611.

It is an arithmetic number, because the mean of its divisors is an integer number (275359219443).

Almost surely, 2^{1101201221221} is an apocalyptic number.

It is an amenable number.

1101201221221 is a deficient number, since it is larger than the sum of its proper divisors (235656551).

1101201221221 is an equidigital number, since it uses as much as digits as its factorization.

1101201221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235656550.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1101201221221 its reverse (1221221021011), we get a palindrome (2322422242232).

The spelling of 1101201221221 in words is "one trillion, one hundred one billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-one".