221500140 has 48 divisors (see below), whose sum is σ = 656685792. Its totient is φ = 55591936.

The previous prime is 221500133. The next prime is 221500141. The reversal of 221500140 is 41005122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (221500141) 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, 107559 + ... + 109598.

It is an arithmetic number, because the mean of its divisors is an integer number (13680954).

Almost surely, 2^221500140 is an apocalyptic number.

221500140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221500140 is an abundant number, since it is smaller than the sum of its proper divisors (435185652).

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

221500140 is a wasteful number, since it uses less digits than its factorization.

221500140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217186 (or 217184 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 221500140 is about 14882.8807695285. The cubic root of 221500140 is about 605.0500971652.

Adding to 221500140 its reverse (41005122), we get a palindrome (262505262).

The spelling of 221500140 in words is "two hundred twenty-one million, five hundred thousand, one hundred forty".