1220201121 has 8 divisors (see below), whose sum is σ = 1643707744. Its totient is φ = 805080960.

The previous prime is 1220201089. The next prime is 1220201131. The reversal of 1220201121 is 1211020221.

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

It is not a de Polignac number, because 1220201121 - 2⁵ = 1220201089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220201097 and 1220201106.

It is not an unprimeable number, because it can be changed into a prime (1220201131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2096275 + ... + 2096856.

It is an arithmetic number, because the mean of its divisors is an integer number (205463468).

Almost surely, 2^1220201121 is an apocalyptic number.

It is an amenable number.

1220201121 is a deficient number, since it is larger than the sum of its proper divisors (423506623).

1220201121 is an equidigital number, since it uses as much as digits as its factorization.

1220201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193231.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1220201121 is about 34931.3773132409. The cubic root of 1220201121 is about 1068.5884437991.

Adding to 1220201121 its reverse (1211020221), we get a palindrome (2431221342).

Subtracting from 1220201121 its reverse (1211020221), we obtain a square (9180900 = 3030²).

The spelling of 1220201121 in words is "one billion, two hundred twenty million, two hundred one thousand, one hundred twenty-one".