641221613217 has 24 divisors (see below), whose sum is σ = 941099964480. Its totient is φ = 420631985760.

The previous prime is 641221613141. The next prime is 641221613233. The reversal of 641221613217 is 712316122146.

641221613217 is a `hidden beast` number, since 6 + 4 + 1 + 2 + 21 + 613 + 2 + 17 = 666.

It is not a de Polignac number, because 641221613217 - 2¹⁴ = 641221596833 is a prime.

It is a super-2 number, since 2×641221613217² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641221613237) 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 23 ways as a sum of consecutive naturals, for example, 660483 + ... + 1310984.

It is an arithmetic number, because the mean of its divisors is an integer number (39212498520).

Almost surely, 2^641221613217 is an apocalyptic number.

It is an amenable number.

641221613217 is a deficient number, since it is larger than the sum of its proper divisors (299878351263).

641221613217 is a wasteful number, since it uses less digits than its factorization.

641221613217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972053 (or 1972050 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The spelling of 641221613217 in words is "six hundred forty-one billion, two hundred twenty-one million, six hundred thirteen thousand, two hundred seventeen".