142839221 has 8 divisors (see below), whose sum is σ = 163322880. Its totient is φ = 122375088.

The previous prime is 142839209. The next prime is 142839233. The reversal of 142839221 is 122938241.

It is an interprime number because it is at equal distance from previous prime (142839209) and next prime (142839233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142839221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142839271) 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 in 7 ways as a sum of consecutive naturals, for example, 17900 + ... + 24618.

It is an arithmetic number, because the mean of its divisors is an integer number (20415360).

Almost surely, 2^142839221 is an apocalyptic number.

It is an amenable number.

142839221 is a deficient number, since it is larger than the sum of its proper divisors (20483659).

142839221 is an equidigital number, since it uses as much as digits as its factorization.

142839221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9763.

The product of its digits is 6912, while the sum is 32.

The square root of 142839221 is about 11951.5363447550. The cubic root of 142839221 is about 522.7360971424.

The spelling of 142839221 in words is "one hundred forty-two million, eight hundred thirty-nine thousand, two hundred twenty-one".