641221613236 has 12 divisors (see below), whose sum is σ = 1122166978240. Its totient is φ = 320602476600.

The previous prime is 641221613233. The next prime is 641221613237. The reversal of 641221613236 is 632316122146.

641221613236 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641221613236² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641221613195 and 641221613204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641221613233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1907676 + ... + 2218483.

Almost surely, 2^641221613236 is an apocalyptic number.

It is an amenable number.

641221613236 is a deficient number, since it is larger than the sum of its proper divisors (480945365004).

641221613236 is a wasteful number, since it uses less digits than its factorization.

641221613236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165014 (or 4165012 counting only the distinct ones).

The product of its digits is 62208, while the sum is 37.

The spelling of 641221613236 in words is "six hundred forty-one billion, two hundred twenty-one million, six hundred thirteen thousand, two hundred thirty-six".