140921 has 8 divisors (see below), whose sum is σ = 160704. Its totient is φ = 122320.

The previous prime is 140909. The next prime is 140929. The reversal of 140921 is 129041.

140921 = T₉₉ + T₁₀₀ + ... + T₁₂₁.

It is a happy number.

140921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-140921 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 140921.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 140921.

It is not an unprimeable number, because it can be changed into a prime (140929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26 + ... + 531.

It is an arithmetic number, because the mean of its divisors is an integer number (20088).

2¹⁴⁰⁹²¹ is an apocalyptic number.

140921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140921 is a deficient number, since it is larger than the sum of its proper divisors (19783).

140921 is a wasteful number, since it uses less digits than its factorization.

140921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 140921 is about 375.3944592026. The cubic root of 140921 is about 52.0385562174.

Adding to 140921 its reverse (129041), we get a palindrome (269962).

The spelling of 140921 in words is "one hundred forty thousand, nine hundred twenty-one".