21644650466202 has 32 divisors (see below), whose sum is σ = 46612607198400. Its totient is φ = 6675385718528.

The previous prime is 21644650466191. The next prime is 21644650466203. The reversal of 21644650466202 is 20266405644612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21644650466203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1798319877 + ... + 1798331912.

It is an arithmetic number, because the mean of its divisors is an integer number (1456643974950).

Almost surely, 2^{21644650466202} is an apocalyptic number.

21644650466202 is an abundant number, since it is smaller than the sum of its proper divisors (24967956732198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21644650466202 is a wasteful number, since it uses less digits than its factorization.

21644650466202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3596651870.

The product of its (nonzero) digits is 3317760, while the sum is 48.

The spelling of 21644650466202 in words is "twenty-one trillion, six hundred forty-four billion, six hundred fifty million, four hundred sixty-six thousand, two hundred two".