140520221 has 4 divisors (see below), whose sum is σ = 140544000. Its totient is φ = 140496444.

The previous prime is 140520209. The next prime is 140520227. The reversal of 140520221 is 122025041.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 140520221 - 2⁶ = 140520157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 140520221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140520227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4580 + ... + 17378.

It is an arithmetic number, because the mean of its divisors is an integer number (35136000).

Almost surely, 2^140520221 is an apocalyptic number.

It is an amenable number.

140520221 is a deficient number, since it is larger than the sum of its proper divisors (23779).

140520221 is a wasteful number, since it uses less digits than its factorization.

140520221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23778.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 140520221 is about 11854.1225318452. The cubic root of 140520221 is about 519.8917686482.

Adding to 140520221 its reverse (122025041), we get a palindrome (262545262).

The spelling of 140520221 in words is "one hundred forty million, five hundred twenty thousand, two hundred twenty-one".