221335536636 has 96 divisors (see below), whose sum is σ = 596697595200. Its totient is φ = 70865141760.

The previous prime is 221335536601. The next prime is 221335536677. The reversal of 221335536636 is 636635533122.

It is a happy number.

221335536636 is a `hidden beast` number, since 2 + 2 + 1 + 3 + 3 + 5 + 5 + 3 + 6 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 221335536591 and 221335536600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 421396 + ... + 787556.

It is an arithmetic number, because the mean of its divisors is an integer number (6215599950).

Almost surely, 2^221335536636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221335536636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298348797600).

221335536636 is an abundant number, since it is smaller than the sum of its proper divisors (375362058564).

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

221335536636 is a wasteful number, since it uses less digits than its factorization.

221335536636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366396 (or 366388 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 45.

The spelling of 221335536636 in words is "two hundred twenty-one billion, three hundred thirty-five million, five hundred thirty-six thousand, six hundred thirty-six".