640132520221 has 8 divisors (see below), whose sum is σ = 641065400000. Its totient is φ = 639200315520.

The previous prime is 640132520213. The next prime is 640132520233. The reversal of 640132520221 is 122025231046.

640132520221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640132520221 - 2³ = 640132520213 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 640132520221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640132520821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1744840 + ... + 2079598.

It is an arithmetic number, because the mean of its divisors is an integer number (80133175000).

Almost surely, 2^640132520221 is an apocalyptic number.

It is an amenable number.

640132520221 is a deficient number, since it is larger than the sum of its proper divisors (932879779).

640132520221 is a wasteful number, since it uses less digits than its factorization.

640132520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337539.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 640132520221 its reverse (122025231046), we get a palindrome (762157751267).

The spelling of 640132520221 in words is "six hundred forty billion, one hundred thirty-two million, five hundred twenty thousand, two hundred twenty-one".