143521321 has 2 divisors, whose sum is σ = 143521322. Its totient is φ = 143521320.

The previous prime is 143521309. The next prime is 143521331. The reversal of 143521321 is 123125341.

It is a happy number.

143521321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128029225 + 15492096 = 11315^2 + 3936^2 .

It is a cyclic number.

It is not a de Polignac number, because 143521321 - 2⁹ = 143520809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 143521292 and 143521301.

It is not a weakly prime, because it can be changed into another prime (143521331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71760660 + 71760661.

It is an arithmetic number, because the mean of its divisors is an integer number (71760661).

Almost surely, 2^143521321 is an apocalyptic number.

It is an amenable number.

143521321 is a deficient number, since it is larger than the sum of its proper divisors (1).

143521321 is an equidigital number, since it uses as much as digits as its factorization.

143521321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 143521321 is about 11980.0384390034. The cubic root of 143521321 is about 523.5668499119.

Adding to 143521321 its reverse (123125341), we get a palindrome (266646662).

The spelling of 143521321 in words is "one hundred forty-three million, five hundred twenty-one thousand, three hundred twenty-one".