221640141 has 16 divisors (see below), whose sum is σ = 297835200. Its totient is φ = 146608128.

The previous prime is 221640131. The next prime is 221640277. The reversal of 221640141 is 141046122.

It is a happy number.

It is not a de Polignac number, because 221640141 - 2¹⁸ = 221377997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221640131) 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, 299550 + ... + 300288.

It is an arithmetic number, because the mean of its divisors is an integer number (18614700).

Almost surely, 2^221640141 is an apocalyptic number.

It is an amenable number.

221640141 is a deficient number, since it is larger than the sum of its proper divisors (76195059).

221640141 is a wasteful number, since it uses less digits than its factorization.

221640141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 221640141 is about 14887.5834506477. The cubic root of 221640141 is about 605.1775459608.

Adding to 221640141 its reverse (141046122), we get a palindrome (362686263).

The spelling of 221640141 in words is "two hundred twenty-one million, six hundred forty thousand, one hundred forty-one".