1143210021 has 4 divisors (see below), whose sum is σ = 1524280032. Its totient is φ = 762140012.

The previous prime is 1143210017. The next prime is 1143210041. The reversal of 1143210021 is 1200123411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1200123411 = 3 ⋅400041137.

It is a cyclic number.

It is not a de Polignac number, because 1143210021 - 2² = 1143210017 is a prime.

It is a super-2 number, since 2×1143210021² = 2613858304229640882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143210001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190535001 + ... + 190535006.

It is an arithmetic number, because the mean of its divisors is an integer number (381070008).

Almost surely, 2^1143210021 is an apocalyptic number.

It is an amenable number.

1143210021 is a deficient number, since it is larger than the sum of its proper divisors (381070011).

1143210021 is an equidigital number, since it uses as much as digits as its factorization.

1143210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381070010.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1143210021 is about 33811.3889244438. The cubic root of 1143210021 is about 1045.6235134930.

Adding to 1143210021 its reverse (1200123411), we get a palindrome (2343333432).

The spelling of 1143210021 in words is "one billion, one hundred forty-three million, two hundred ten thousand, twenty-one".