140320021 has 8 divisors (see below), whose sum is σ = 144441344. Its totient is φ = 136216080.

The previous prime is 140320001. The next prime is 140320039. The reversal of 140320021 is 120023041.

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-140320021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140319983 and 140320010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140320001) 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, 13036 + ... + 21226.

It is an arithmetic number, because the mean of its divisors is an integer number (18055168).

Almost surely, 2^140320021 is an apocalyptic number.

It is an amenable number.

140320021 is a deficient number, since it is larger than the sum of its proper divisors (4121323).

140320021 is an equidigital number, since it uses as much as digits as its factorization.

140320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8691.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 140320021 is about 11845.6752023682. The cubic root of 140320021 is about 519.6447536648.

Adding to 140320021 its reverse (120023041), we get a palindrome (260343062).

The spelling of 140320021 in words is "one hundred forty million, three hundred twenty thousand, twenty-one".