132640421 has 4 divisors (see below), whose sum is σ = 132680172. Its totient is φ = 132600672.

The previous prime is 132640373. The next prime is 132640433. The reversal of 132640421 is 124046231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124046231 = 19 ⋅6528749.

It can be written as a sum of positive squares in 2 ways, for example, as 114789796 + 17850625 = 10714^2 + 4225^2 .

It is a cyclic number.

It is not a de Polignac number, because 132640421 - 2⁶ = 132640357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (132640481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14360 + ... + 21713.

It is an arithmetic number, because the mean of its divisors is an integer number (33170043).

Almost surely, 2^132640421 is an apocalyptic number.

It is an amenable number.

132640421 is a deficient number, since it is larger than the sum of its proper divisors (39751).

132640421 is an equidigital number, since it uses as much as digits as its factorization.

132640421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39750.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 132640421 is about 11516.9623165138. The cubic root of 132640421 is about 509.9864420335.

Adding to 132640421 its reverse (124046231), we get a palindrome (256686652).

The spelling of 132640421 in words is "one hundred thirty-two million, six hundred forty thousand, four hundred twenty-one".