142221644 has 12 divisors (see below), whose sum is σ = 251685000. Its totient is φ = 70311648.

The previous prime is 142221623. The next prime is 142221689. The reversal of 142221644 is 446122241.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199394 + ... + 200105.

It is an arithmetic number, because the mean of its divisors is an integer number (20973750).

Almost surely, 2^142221644 is an apocalyptic number.

It is an amenable number.

142221644 is a deficient number, since it is larger than the sum of its proper divisors (109463356).

142221644 is a wasteful number, since it uses less digits than its factorization.

142221644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399592 (or 399590 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

The square root of 142221644 is about 11925.6716372706. The cubic root of 142221644 is about 521.9816447601.

Adding to 142221644 its reverse (446122241), we get a palindrome (588343885).

The spelling of 142221644 in words is "one hundred forty-two million, two hundred twenty-one thousand, six hundred forty-four".