143122221 has 60 divisors (see below), whose sum is σ = 242820864. Its totient is φ = 83311200.

The previous prime is 143122211. The next prime is 143122229. The reversal of 143122221 is 122221341.

It is a happy number.

It is not a de Polignac number, because 143122221 - 2⁷ = 143122093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 143122194 and 143122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143122229) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 749236 + ... + 749426.

Almost surely, 2^143122221 is an apocalyptic number.

143122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

143122221 is a deficient number, since it is larger than the sum of its proper divisors (99698643).

143122221 is a wasteful number, since it uses less digits than its factorization.

143122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 234 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 143122221 is about 11963.3699683659. The cubic root of 143122221 is about 523.0810927807.

Adding to 143122221 its reverse (122221341), we get a palindrome (265343562).

The spelling of 143122221 in words is "one hundred forty-three million, one hundred twenty-two thousand, two hundred twenty-one".