1143221421 has 16 divisors (see below), whose sum is σ = 1533862400. Its totient is φ = 757375920.

The previous prime is 1143221399. The next prime is 1143221437. The reversal of 1143221421 is 1241223411.

It is not a de Polignac number, because 1143221421 - 2⁷ = 1143221293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143221461) 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, 672030 + ... + 673728.

It is an arithmetic number, because the mean of its divisors is an integer number (95866400).

Almost surely, 2^1143221421 is an apocalyptic number.

It is an amenable number.

1143221421 is a deficient number, since it is larger than the sum of its proper divisors (390640979).

1143221421 is a wasteful number, since it uses less digits than its factorization.

1143221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976.

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

The square root of 1143221421 is about 33811.5575062729. The cubic root of 1143221421 is about 1045.6269891065.

Adding to 1143221421 its reverse (1241223411), we get a palindrome (2384444832).

The spelling of 1143221421 in words is "one billion, one hundred forty-three million, two hundred twenty-one thousand, four hundred twenty-one".