221189240 has 64 divisors (see below), whose sum is σ = 506338560. Its totient is φ = 86952960.

The previous prime is 221189237. The next prime is 221189249. The reversal of 221189240 is 42981122.

221189240 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221189249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 991769 + ... + 991991.

It is an arithmetic number, because the mean of its divisors is an integer number (7911540).

Almost surely, 2^221189240 is an apocalyptic number.

221189240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221189240 is an abundant number, since it is smaller than the sum of its proper divisors (285149320).

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

221189240 is a wasteful number, since it uses less digits than its factorization.

221189240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 221189240 is about 14872.4322153439. The cubic root of 221189240 is about 604.7668796542.

The spelling of 221189240 in words is "two hundred twenty-one million, one hundred eighty-nine thousand, two hundred forty".