143888021 has 2 divisors, whose sum is σ = 143888022. Its totient is φ = 143888020.

The previous prime is 143888011. The next prime is 143888027. The reversal of 143888021 is 120888341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131560900 + 12327121 = 11470^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 143888021 - 2²² = 139693717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143888027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71944010 + 71944011.

It is an arithmetic number, because the mean of its divisors is an integer number (71944011).

Almost surely, 2^143888021 is an apocalyptic number.

It is an amenable number.

143888021 is a deficient number, since it is larger than the sum of its proper divisors (1).

143888021 is an equidigital number, since it uses as much as digits as its factorization.

143888021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 143888021 is about 11995.3333009133. Note that the first 4 decimals coincide. The cubic root of 143888021 is about 524.0123787939.

The spelling of 143888021 in words is "one hundred forty-three million, eight hundred eighty-eight thousand, twenty-one".