221142043 has 4 divisors (see below), whose sum is σ = 221897088. Its totient is φ = 220387000.

The previous prime is 221142041. The next prime is 221142049. The reversal of 221142043 is 340241122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221142043 - 2¹ = 221142041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221142043.

It is not an unprimeable number, because it can be changed into a prime (221142041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377083 + ... + 377668.

It is an arithmetic number, because the mean of its divisors is an integer number (55474272).

Almost surely, 2^221142043 is an apocalyptic number.

221142043 is a deficient number, since it is larger than the sum of its proper divisors (755045).

221142043 is an equidigital number, since it uses as much as digits as its factorization.

221142043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755044.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 221142043 is about 14870.8454030025. The cubic root of 221142043 is about 604.7238618703.

Adding to 221142043 its reverse (340241122), we get a palindrome (561383165).

The spelling of 221142043 in words is "two hundred twenty-one million, one hundred forty-two thousand, forty-three".