140230021 has 4 divisors (see below), whose sum is σ = 140408992. Its totient is φ = 140051052.

The previous prime is 140230001. The next prime is 140230039. The reversal of 140230021 is 120032041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120032041 = 67 ⋅1791523.

It is a cyclic number.

It is not a de Polignac number, because 140230021 - 2¹⁷ = 140098949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140229983 and 140230010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140230001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88305 + ... + 89878.

It is an arithmetic number, because the mean of its divisors is an integer number (35102248).

Almost surely, 2^140230021 is an apocalyptic number.

It is an amenable number.

140230021 is a deficient number, since it is larger than the sum of its proper divisors (178971).

140230021 is an equidigital number, since it uses as much as digits as its factorization.

140230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178970.

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

The square root of 140230021 is about 11841.8757382435. The cubic root of 140230021 is about 519.5336314127.

Adding to 140230021 its reverse (120032041), we get a palindrome (260262062).

The spelling of 140230021 in words is "one hundred forty million, two hundred thirty thousand, twenty-one".