221514240 has 80 divisors (see below), whose sum is σ = 708177888. Its totient is φ = 59068416.

The previous prime is 221514203. The next prime is 221514247. The reversal of 221514240 is 42415122.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (221514247) 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, 6742 + ... + 22101.

Almost surely, 2^221514240 is an apocalyptic number.

221514240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221514240 is an abundant number, since it is smaller than the sum of its proper divisors (486663648).

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

221514240 is an equidigital number, since it uses as much as digits as its factorization.

221514240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28869 (or 28853 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 221514240 is about 14883.3544606046. The cubic root of 221514240 is about 605.0629354195.

Adding to 221514240 its reverse (42415122), we get a palindrome (263929362).

The spelling of 221514240 in words is "two hundred twenty-one million, five hundred fourteen thousand, two hundred forty".