221494140 has 144 divisors (see below), whose sum is σ = 801335808. Its totient is φ = 48419712.

The previous prime is 221494123. The next prime is 221494151. The reversal of 221494140 is 41494122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25159 + ... + 32801.

It is an arithmetic number, because the mean of its divisors is an integer number (5564832).

Almost surely, 2^221494140 is an apocalyptic number.

221494140 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 221494140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (400667904).

221494140 is an abundant number, since it is smaller than the sum of its proper divisors (579841668).

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

221494140 is a wasteful number, since it uses less digits than its factorization.

221494140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7688 (or 7683 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 221494140 is about 14882.6791942849. The cubic root of 221494140 is about 605.0446339131.

The spelling of 221494140 in words is "two hundred twenty-one million, four hundred ninety-four thousand, one hundred forty".