1143505021 has 2 divisors, whose sum is σ = 1143505022. Its totient is φ = 1143505020.

The previous prime is 1143505001. The next prime is 1143505049. The reversal of 1143505021 is 1205053411.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 815388025 + 328116996 = 28555^2 + 18114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143505021 - 2¹³ = 1143496829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1143504983 and 1143505001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143505001) 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 as a sum of consecutive naturals, namely, 571752510 + 571752511.

It is an arithmetic number, because the mean of its divisors is an integer number (571752511).

Almost surely, 2^1143505021 is an apocalyptic number.

It is an amenable number.

1143505021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143505021 is an equidigital number, since it uses as much as digits as its factorization.

1143505021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1143505021 is about 33815.7510784545. The cubic root of 1143505021 is about 1045.7134451773.

Adding to 1143505021 its reverse (1205053411), we get a palindrome (2348558432).

The spelling of 1143505021 in words is "one billion, one hundred forty-three million, five hundred five thousand, twenty-one".