143221520 has 40 divisors (see below), whose sum is σ = 358607256. Its totient is φ = 52881408.

The previous prime is 143221513. The next prime is 143221577. The reversal of 143221520 is 25122341.

It can be written as a sum of positive squares in 4 ways, for example, as 753424 + 142468096 = 868^2 + 11936^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×143221520² = 41024807582220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 143221492 and 143221501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67817 + ... + 69896.

Almost surely, 2^143221520 is an apocalyptic number.

143221520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

143221520 is an abundant number, since it is smaller than the sum of its proper divisors (215385736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

143221520 is a wasteful number, since it uses less digits than its factorization.

143221520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137739 (or 137733 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 143221520 is about 11967.5193753760. The cubic root of 143221520 is about 523.2020370135.

Adding to 143221520 its reverse (25122341), we get a palindrome (168343861).

The spelling of 143221520 in words is "one hundred forty-three million, two hundred twenty-one thousand, five hundred twenty".