221642043 has 12 divisors (see below), whose sum is σ = 343771560. Its totient is φ = 126652512.

The previous prime is 221642009. The next prime is 221642059. The reversal of 221642043 is 340246122.

It is not a de Polignac number, because 221642043 - 2¹⁴ = 221625659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221442043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 753738 + ... + 754031.

It is an arithmetic number, because the mean of its divisors is an integer number (28647630).

Almost surely, 2^221642043 is an apocalyptic number.

221642043 is a deficient number, since it is larger than the sum of its proper divisors (122129517).

221642043 is a wasteful number, since it uses less digits than its factorization.

221642043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507786 (or 1507779 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 221642043 is about 14887.6473292458. The cubic root of 221642043 is about 605.1792770618.

Adding to 221642043 its reverse (340246122), we get a palindrome (561888165).

The spelling of 221642043 in words is "two hundred twenty-one million, six hundred forty-two thousand, forty-three".