221996544 has 160 divisors (see below), whose sum is σ = 737738496. Its totient is φ = 57630720.

The previous prime is 221996521. The next prime is 221996561. The reversal of 221996544 is 445699122.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 221996496 and 221996505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117334 + ... + 119210.

Almost surely, 2^221996544 is an apocalyptic number.

221996544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221996544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368869248).

221996544 is an abundant number, since it is smaller than the sum of its proper divisors (515741952).

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

221996544 is a wasteful number, since it uses less digits than its factorization.

221996544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916 (or 1900 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 221996544 is about 14899.5484495336. The cubic root of 221996544 is about 605.5017525554.

The spelling of 221996544 in words is "two hundred twenty-one million, nine hundred ninety-six thousand, five hundred forty-four".