1143145421 has 16 divisors (see below), whose sum is σ = 1281063168. Its totient is φ = 1011153600.

The previous prime is 1143145387. The next prime is 1143145427. The reversal of 1143145421 is 1245413411.

It is a cyclic number.

It is not a de Polignac number, because 1143145421 - 2²² = 1138951117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143145427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83051 + ... + 95831.

It is an arithmetic number, because the mean of its divisors is an integer number (80066448).

Almost surely, 2^1143145421 is an apocalyptic number.

1143145421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1143145421 is a deficient number, since it is larger than the sum of its proper divisors (137917747).

1143145421 is a wasteful number, since it uses less digits than its factorization.

1143145421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13012.

The product of its digits is 1920, while the sum is 26.

The square root of 1143145421 is about 33810.4336115348. The cubic root of 1143145421 is about 1045.6038179136.

Adding to 1143145421 its reverse (1245413411), we get a palindrome (2388558832).

The spelling of 1143145421 in words is "one billion, one hundred forty-three million, one hundred forty-five thousand, four hundred twenty-one".