143251021 has 2 divisors, whose sum is σ = 143251022. Its totient is φ = 143251020.

The previous prime is 143251019. The next prime is 143251033. The reversal of 143251021 is 120152341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141276996 + 1974025 = 11886^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 143251021 - 2¹ = 143251019 is a prime.

Together with 143251019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 143251021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143251001) 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, 71625510 + 71625511.

It is an arithmetic number, because the mean of its divisors is an integer number (71625511).

Almost surely, 2^143251021 is an apocalyptic number.

It is an amenable number.

143251021 is a deficient number, since it is larger than the sum of its proper divisors (1).

143251021 is an equidigital number, since it uses as much as digits as its factorization.

143251021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 143251021 is about 11968.7518563967. The cubic root of 143251021 is about 523.2379578808.

The spelling of 143251021 in words is "one hundred forty-three million, two hundred fifty-one thousand, twenty-one".