221190140 has 24 divisors (see below), whose sum is σ = 464788800. Its totient is φ = 88420928.

The previous prime is 221190139. The next prime is 221190143. The reversal of 221190140 is 41091122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221190143) 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, 48686 + ... + 53034.

It is an arithmetic number, because the mean of its divisors is an integer number (19366200).

Almost surely, 2^221190140 is an apocalyptic number.

221190140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221190140 is an abundant number, since it is smaller than the sum of its proper divisors (243598660).

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

221190140 is a wasteful number, since it uses less digits than its factorization.

221190140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6901 (or 6899 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 221190140 is about 14872.4624726371. The cubic root of 221190140 is about 604.7676999013.

The spelling of 221190140 in words is "two hundred twenty-one million, one hundred ninety thousand, one hundred forty".