143430021 has 44 divisors (see below), whose sum is σ = 246587232. Its totient is φ = 81723816.

The previous prime is 143430017. The next prime is 143430101. The reversal of 143430021 is 120034341.

It is not a de Polignac number, because 143430021 - 2² = 143430017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 143429976 and 143430003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143432021) by changing a digit.

It is a polite number, since it can be written in 43 ways as a sum of consecutive naturals, for example, 413170 + ... + 413516.

Almost surely, 2^143430021 is an apocalyptic number.

It is an amenable number.

143430021 is a deficient number, since it is larger than the sum of its proper divisors (103157211).

143430021 is an frugal number, since it uses more digits than its factorization.

143430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 143430021 is about 11976.2273275018. The cubic root of 143430021 is about 523.4558053347.

Adding to 143430021 its reverse (120034341), we get a palindrome (263464362).

The spelling of 143430021 in words is "one hundred forty-three million, four hundred thirty thousand, twenty-one".