1144203021 has 12 divisors (see below), whose sum is σ = 1779871548. Its totient is φ = 704124864.

The previous prime is 1144203017. The next prime is 1144203023. The reversal of 1144203021 is 1203024411.

It can be written as a sum of positive squares in 2 ways, for example, as 437228100 + 706974921 = 20910^2 + 26589^2 .

It is not a de Polignac number, because 1144203021 - 2² = 1144203017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1144202985 and 1144203003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144203023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4889640 + ... + 4889873.

It is an arithmetic number, because the mean of its divisors is an integer number (148322629).

Almost surely, 2^1144203021 is an apocalyptic number.

It is an amenable number.

1144203021 is a deficient number, since it is larger than the sum of its proper divisors (635668527).

1144203021 is a wasteful number, since it uses less digits than its factorization.

1144203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9779532 (or 9779529 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1144203021 is about 33826.0701382824. The cubic root of 1144203021 is about 1045.9261711117.

Adding to 1144203021 its reverse (1203024411), we get a palindrome (2347227432).

The spelling of 1144203021 in words is "one billion, one hundred forty-four million, two hundred three thousand, twenty-one".