221670036 has 144 divisors (see below), whose sum is σ = 685135360. Its totient is φ = 59019840.

The previous prime is 221670011. The next prime is 221670037. The reversal of 221670036 is 630076122.

It is a happy number.

221670036 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221669991 and 221670009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221670037) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 320451 + ... + 321141.

Almost surely, 2^221670036 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 221670036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342567680).

221670036 is an abundant number, since it is smaller than the sum of its proper divisors (463465324).

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

221670036 is a wasteful number, since it uses less digits than its factorization.

221670036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 221670036 is about 14888.5874413928. The cubic root of 221670036 is about 605.2047536819.

The spelling of 221670036 in words is "two hundred twenty-one million, six hundred seventy thousand, thirty-six".