221439520 has 48 divisors (see below), whose sum is σ = 525184128. Its totient is φ = 88231680.

The previous prime is 221439499. The next prime is 221439529. The reversal of 221439520 is 25934122.

It is a super-2 number, since 2×221439520² = 98070922035660800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221439529) 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, 40807 + ... + 45913.

It is an arithmetic number, because the mean of its divisors is an integer number (10941336).

Almost surely, 2^221439520 is an apocalyptic number.

221439520 is a gapful number since it is divisible by the number (20) 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 221439520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262592064).

221439520 is an abundant number, since it is smaller than the sum of its proper divisors (303744608).

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

221439520 is a wasteful number, since it uses less digits than its factorization.

221439520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5393 (or 5385 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 221439520 is about 14880.8440620820. The cubic root of 221439520 is about 604.9948955697.

The spelling of 221439520 in words is "two hundred twenty-one million, four hundred thirty-nine thousand, five hundred twenty".