142204321 has 12 divisors (see below), whose sum is σ = 166034388. Its totient is φ = 121437792.

The previous prime is 142204319. The next prime is 142204333. The reversal of 142204321 is 123402241.

It can be written as a sum of positive squares in 2 ways, for example, as 65028096 + 77176225 = 8064^2 + 8785^2 .

It is not a de Polignac number, because 142204321 - 2¹ = 142204319 is a prime.

It is a super-2 number, since 2×142204321² = 40444137822142082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142204021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8335 + ... + 18811.

It is an arithmetic number, because the mean of its divisors is an integer number (13836199).

Almost surely, 2^142204321 is an apocalyptic number.

It is an amenable number.

142204321 is a deficient number, since it is larger than the sum of its proper divisors (23830067).

142204321 is a wasteful number, since it uses less digits than its factorization.

142204321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10768 (or 10761 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 142204321 is about 11924.9453248222. The cubic root of 142204321 is about 521.9604509508.

Adding to 142204321 its reverse (123402241), we get a palindrome (265606562).

The spelling of 142204321 in words is "one hundred forty-two million, two hundred four thousand, three hundred twenty-one".