221473536 has 72 divisors (see below), whose sum is σ = 592105920. Its totient is φ = 73491456.

The previous prime is 221473531. The next prime is 221473537. The reversal of 221473536 is 635374122.

It is a junction number, because it is equal to n+sod(n) for n = 221473497 and 221473506.

It is not an unprimeable number, because it can be changed into a prime (221473531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216835 + ... + 217853.

Almost surely, 2^221473536 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 221473536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296052960).

221473536 is an abundant number, since it is smaller than the sum of its proper divisors (370632384).

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

221473536 is a wasteful number, since it uses less digits than its factorization.

221473536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321 (or 1307 counting only the distinct ones).

The product of its digits is 30240, while the sum is 33.

The square root of 221473536 is about 14881.9869641120. The cubic root of 221473536 is about 605.0258723539.

The spelling of 221473536 in words is "two hundred twenty-one million, four hundred seventy-three thousand, five hundred thirty-six".