221143641 has 32 divisors (see below), whose sum is σ = 317260800. Its totient is φ = 136612800.

The previous prime is 221143621. The next prime is 221143661. The reversal of 221143641 is 146341122.

221143641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221143621) and next prime (221143661).

It is not a de Polignac number, because 221143641 - 2⁵ = 221143609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221143621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 615820 + ... + 616178.

It is an arithmetic number, because the mean of its divisors is an integer number (9914400).

Almost surely, 2^221143641 is an apocalyptic number.

It is an amenable number.

221143641 is a deficient number, since it is larger than the sum of its proper divisors (96117159).

221143641 is a wasteful number, since it uses less digits than its factorization.

221143641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589.

The product of its digits is 1152, while the sum is 24.

The square root of 221143641 is about 14870.8991321978. The cubic root of 221143641 is about 604.7253184701.

Adding to 221143641 its reverse (146341122), we get a palindrome (367484763).

The spelling of 221143641 in words is "two hundred twenty-one million, one hundred forty-three thousand, six hundred forty-one".