1122001221 has 16 divisors (see below), whose sum is σ = 1651668480. Its totient is φ = 671806320.

The previous prime is 1122001217. The next prime is 1122001261. The reversal of 1122001221 is 1221002211.

It is not a de Polignac number, because 1122001221 - 2² = 1122001217 is a prime.

1122001221 is a modest number, since divided by 1221 gives 1122 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1122001197 and 1122001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122001211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202081 + ... + 207558.

It is an arithmetic number, because the mean of its divisors is an integer number (103229280).

Almost surely, 2^1122001221 is an apocalyptic number.

1122001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1122001221 is a deficient number, since it is larger than the sum of its proper divisors (529667259).

1122001221 is a wasteful number, since it uses less digits than its factorization.

1122001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409736.

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

The square root of 1122001221 is about 33496.2866747943. The cubic root of 1122001221 is about 1039.1169837800.

Adding to 1122001221 its reverse (1221002211), we get a palindrome (2343003432).

The spelling of 1122001221 in words is "one billion, one hundred twenty-two million, one thousand, two hundred twenty-one".