1220101121 has 4 divisors (see below), whose sum is σ = 1222586544. Its totient is φ = 1217615700.

The previous prime is 1220101087. The next prime is 1220101123. The reversal of 1220101121 is 1211010221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1211010221 = 347 ⋅3489943.

It is a cyclic number.

It is not a de Polignac number, because 1220101121 - 2¹⁰ = 1220100097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220101123) 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, 1241975 + ... + 1242956.

It is an arithmetic number, because the mean of its divisors is an integer number (305646636).

Almost surely, 2^1220101121 is an apocalyptic number.

It is an amenable number.

1220101121 is a deficient number, since it is larger than the sum of its proper divisors (2485423).

1220101121 is an equidigital number, since it uses as much as digits as its factorization.

1220101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2485422.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1220101121 is about 34929.9459060560. The cubic root of 1220101121 is about 1068.5592514084.

Adding to 1220101121 its reverse (1211010221), we get a palindrome (2431111342).

The spelling of 1220101121 in words is "one billion, two hundred twenty million, one hundred one thousand, one hundred twenty-one".