1221101201219 has 4 divisors (see below), whose sum is σ = 1241119253760. Its totient is φ = 1201083148680.

The previous prime is 1221101201183. The next prime is 1221101201239. The reversal of 1221101201219 is 9121021011221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1221101201219 - 2²⁴ = 1221084424003 is a prime.

It is a super-2 number, since 2×1221101201219² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221101201194 and 1221101201203.

It is not an unprimeable number, because it can be changed into a prime (1221101201239) 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, 10009026179 + ... + 10009026300.

It is an arithmetic number, because the mean of its divisors is an integer number (310279813440).

Almost surely, 2^{1221101201219} is an apocalyptic number.

1221101201219 is a deficient number, since it is larger than the sum of its proper divisors (20018052541).

1221101201219 is an equidigital number, since it uses as much as digits as its factorization.

1221101201219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20018052540.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 1221101201219 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred one thousand, two hundred nineteen".