221256036 has 60 divisors (see below), whose sum is σ = 580242432. Its totient is φ = 73518192.

The previous prime is 221256023. The next prime is 221256059. The reversal of 221256036 is 630652122.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 123201 + ... + 124983.

Almost surely, 2^221256036 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 221256036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290121216).

221256036 is an abundant number, since it is smaller than the sum of its proper divisors (358986396).

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

221256036 is a wasteful number, since it uses less digits than its factorization.

221256036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182 (or 2171 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 221256036 is about 14874.6776771801. The cubic root of 221256036 is about 604.8277505218.

The spelling of 221256036 in words is "two hundred twenty-one million, two hundred fifty-six thousand, thirty-six".