221959636 has 12 divisors (see below), whose sum is σ = 397462912. Its totient is φ = 108398808.

The previous prime is 221959627. The next prime is 221959657. The reversal of 221959636 is 636959122.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a junction number, because it is equal to n+sod(n) for n = 221959592 and 221959601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645060 + ... + 645403.

Almost surely, 2^221959636 is an apocalyptic number.

It is an amenable number.

221959636 is a deficient number, since it is larger than the sum of its proper divisors (175503276).

221959636 is a wasteful number, since it uses less digits than its factorization.

221959636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290510 (or 1290508 counting only the distinct ones).

The product of its digits is 174960, while the sum is 43.

The square root of 221959636 is about 14898.3098370251. The cubic root of 221959636 is about 605.4681948298.

The spelling of 221959636 in words is "two hundred twenty-one million, nine hundred fifty-nine thousand, six hundred thirty-six".