143021221 has 16 divisors (see below), whose sum is σ = 173522304. Its totient is φ = 115075584.

The previous prime is 143021173. The next prime is 143021237. The reversal of 143021221 is 122120341.

It is not a de Polignac number, because 143021221 - 2⁷ = 143021093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 143021195 and 143021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143021261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51361 + ... + 54073.

It is an arithmetic number, because the mean of its divisors is an integer number (10845144).

Almost surely, 2^143021221 is an apocalyptic number.

It is an amenable number.

143021221 is a deficient number, since it is larger than the sum of its proper divisors (30501083).

143021221 is a wasteful number, since it uses less digits than its factorization.

143021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 143021221 is about 11959.1480047702. The cubic root of 143021221 is about 522.9580193629.

Adding to 143021221 its reverse (122120341), we get a palindrome (265141562).

The spelling of 143021221 in words is "one hundred forty-three million, twenty-one thousand, two hundred twenty-one".