646100046221 has 24 divisors (see below), whose sum is σ = 762314716800. Its totient is φ = 545897436000.

The previous prime is 646100046181. The next prime is 646100046227. The reversal of 646100046221 is 122640001646.

It is not a de Polignac number, because 646100046221 - 2²² = 646095851917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646100046227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22776755 + ... + 22805103.

It is an arithmetic number, because the mean of its divisors is an integer number (31763113200).

Almost surely, 2^646100046221 is an apocalyptic number.

It is an amenable number.

646100046221 is a deficient number, since it is larger than the sum of its proper divisors (116214670579).

646100046221 is a wasteful number, since it uses less digits than its factorization.

646100046221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34985 (or 34978 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

Adding to 646100046221 its reverse (122640001646), we get a palindrome (768740047867).

The spelling of 646100046221 in words is "six hundred forty-six billion, one hundred million, forty-six thousand, two hundred twenty-one".