140221001 has 4 divisors (see below), whose sum is σ = 140727492. Its totient is φ = 139714512.

The previous prime is 140220991. The next prime is 140221021. The reversal of 140221001 is 100122041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9461776 + 130759225 = 3076^2 + 11435^2 .

It is a cyclic number.

It is not a de Polignac number, because 140221001 - 2⁶ = 140220937 is a prime.

It is a super-5 number, since 5×140221001⁵ (a number of 42 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140221021) 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 3 ways as a sum of consecutive naturals, for example, 252830 + ... + 253383.

It is an arithmetic number, because the mean of its divisors is an integer number (35181873).

Almost surely, 2^140221001 is an apocalyptic number.

It is an amenable number.

140221001 is a deficient number, since it is larger than the sum of its proper divisors (506491).

140221001 is an equidigital number, since it uses as much as digits as its factorization.

140221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506490.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 140221001 is about 11841.4948802928. The cubic root of 140221001 is about 519.5224918726.

Adding to 140221001 its reverse (100122041), we get a palindrome (240343042).

The spelling of 140221001 in words is "one hundred forty million, two hundred twenty-one thousand, one".