1143242121 has 16 divisors (see below), whose sum is σ = 1754803584. Its totient is φ = 648511104.

The previous prime is 1143242119. The next prime is 1143242137. The reversal of 1143242121 is 1212423411.

It is not a de Polignac number, because 1143242121 - 2¹ = 1143242119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1143242621) 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 15 ways as a sum of consecutive naturals, for example, 195810 + ... + 201563.

It is an arithmetic number, because the mean of its divisors is an integer number (109675224).

Almost surely, 2^1143242121 is an apocalyptic number.

It is an amenable number.

1143242121 is a deficient number, since it is larger than the sum of its proper divisors (611561463).

1143242121 is a wasteful number, since it uses less digits than its factorization.

1143242121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397520.

The product of its digits is 384, while the sum is 21.

The square root of 1143242121 is about 33811.8636132349. The cubic root of 1143242121 is about 1045.6333000297.

Adding to 1143242121 its reverse (1212423411), we get a palindrome (2355665532).

The spelling of 1143242121 in words is "one billion, one hundred forty-three million, two hundred forty-two thousand, one hundred twenty-one".