140342021 has 8 divisors (see below), whose sum is σ = 155058624. Its totient is φ = 126343360.

The previous prime is 140342011. The next prime is 140342051. The reversal of 140342021 is 120243041.

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-140342021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140342011) 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, 179075 + ... + 179856.

It is an arithmetic number, because the mean of its divisors is an integer number (19382328).

Almost surely, 2^140342021 is an apocalyptic number.

It is an amenable number.

140342021 is a deficient number, since it is larger than the sum of its proper divisors (14716603).

140342021 is a wasteful number, since it uses less digits than its factorization.

140342021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358971.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 140342021 is about 11846.6037749222. The cubic root of 140342021 is about 519.6719096546.

Adding to 140342021 its reverse (120243041), we get a palindrome (260585062).

The spelling of 140342021 in words is "one hundred forty million, three hundred forty-two thousand, twenty-one".