1144021221 has 12 divisors (see below), whose sum is σ = 1888543072. Its totient is φ = 653726376.

The previous prime is 1144021187. The next prime is 1144021327. The reversal of 1144021221 is 1221204411.

1144021221 is a `hidden beast` number, since 1 + 1 + 440 + 2 + 1 + 221 = 666.

It is not a de Polignac number, because 1144021221 - 2⁶ = 1144021157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1144021194 and 1144021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144021421) 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 11 ways as a sum of consecutive naturals, for example, 9079471 + ... + 9079596.

Almost surely, 2^1144021221 is an apocalyptic number.

It is an amenable number.

1144021221 is a deficient number, since it is larger than the sum of its proper divisors (744521851).

1144021221 is a wasteful number, since it uses less digits than its factorization.

1144021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18159080 (or 18159077 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1144021221 is about 33823.3827551296. The cubic root of 1144021221 is about 1045.8707731779.

Adding to 1144021221 its reverse (1221204411), we get a palindrome (2365225632).

The spelling of 1144021221 in words is "one billion, one hundred forty-four million, twenty-one thousand, two hundred twenty-one".