140521213 has 4 divisors (see below), whose sum is σ = 160595680. Its totient is φ = 120446748.

The previous prime is 140521189. The next prime is 140521219. The reversal of 140521213 is 312125041.

140521213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 312125041 = 1789 ⋅174469.

It is a cyclic number.

It is not a de Polignac number, because 140521213 - 2⁹ = 140520701 is a prime.

It is a super-2 number, since 2×140521213² = 39492422605982738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140521219) 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, 10037223 + ... + 10037236.

It is an arithmetic number, because the mean of its divisors is an integer number (40148920).

Almost surely, 2^140521213 is an apocalyptic number.

It is an amenable number.

140521213 is a deficient number, since it is larger than the sum of its proper divisors (20074467).

140521213 is an equidigital number, since it uses as much as digits as its factorization.

140521213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20074466.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 140521213 is about 11854.1643737549. The cubic root of 140521213 is about 519.8929920342.

Adding to 140521213 its reverse (312125041), we get a palindrome (452646254).

The spelling of 140521213 in words is "one hundred forty million, five hundred twenty-one thousand, two hundred thirteen".