1121121221 has 16 divisors (see below), whose sum is σ = 1250823168. Its totient is φ = 996111600.

The previous prime is 1121121103. The next prime is 1121121263. The reversal of 1121121221 is 1221211211.

It is not a de Polignac number, because 1121121221 - 2¹⁴ = 1121104837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121121196 and 1121121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121121271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579626 + ... + 581556.

It is an arithmetic number, because the mean of its divisors is an integer number (78176448).

Almost surely, 2^1121121221 is an apocalyptic number.

1121121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121121221 is a deficient number, since it is larger than the sum of its proper divisors (129701947).

1121121221 is a wasteful number, since it uses less digits than its factorization.

1121121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112.

The product of its digits is 16, while the sum is 14.

The square root of 1121121221 is about 33483.1483137413. The cubic root of 1121121221 is about 1038.8452484505.

Adding to 1121121221 its reverse (1221211211), we get a palindrome (2342332432).

The spelling of 1121121221 in words is "one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".