140185021 has 4 divisors (see below), whose sum is σ = 147563200. Its totient is φ = 132806844.

The previous prime is 140184959. The next prime is 140185033. The reversal of 140185021 is 120581041.

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.

It is a cyclic number.

It is not a de Polignac number, because 140185021 - 2⁹ = 140184509 is a prime.

It is a super-2 number, since 2×140185021² = 39303680225540882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140184983 and 140185001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140185051) 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, 3689061 + ... + 3689098.

It is an arithmetic number, because the mean of its divisors is an integer number (36890800).

Almost surely, 2^140185021 is an apocalyptic number.

It is an amenable number.

140185021 is a deficient number, since it is larger than the sum of its proper divisors (7378179).

140185021 is an equidigital number, since it uses as much as digits as its factorization.

140185021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7378178.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 140185021 is about 11839.9755489612. The cubic root of 140185021 is about 519.4780524563.

The spelling of 140185021 in words is "one hundred forty million, one hundred eighty-five thousand, twenty-one".