143669021 has 4 divisors (see below), whose sum is σ = 144020700. Its totient is φ = 143317344.

The previous prime is 143668979. The next prime is 143669027. The reversal of 143669021 is 120966341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120966341 = 269 ⋅449689.

It can be written as a sum of positive squares in 2 ways, for example, as 66422500 + 77246521 = 8150^2 + 8789^2 .

It is a cyclic number.

It is not a de Polignac number, because 143669021 - 2⁶ = 143668957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143669027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175226 + ... + 176043.

It is an arithmetic number, because the mean of its divisors is an integer number (36005175).

Almost surely, 2^143669021 is an apocalyptic number.

It is an amenable number.

143669021 is a deficient number, since it is larger than the sum of its proper divisors (351679).

143669021 is an equidigital number, since it uses as much as digits as its factorization.

143669021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351678.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 143669021 is about 11986.2012747993. The cubic root of 143669021 is about 523.7463919035.

The spelling of 143669021 in words is "one hundred forty-three million, six hundred sixty-nine thousand, twenty-one".