21220230043 has 4 divisors (see below), whose sum is σ = 21223402528. Its totient is φ = 21217057560.

The previous prime is 21220230029. The next prime is 21220230091. The reversal of 21220230043 is 34003202212.

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 21220230043 - 2⁵ = 21220230011 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 21220230043.

It is not an unprimeable number, because it can be changed into a prime (21220030043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1576188 + ... + 1589593.

It is an arithmetic number, because the mean of its divisors is an integer number (5305850632).

Almost surely, 2^21220230043 is an apocalyptic number.

21220230043 is a deficient number, since it is larger than the sum of its proper divisors (3172485).

21220230043 is an equidigital number, since it uses as much as digits as its factorization.

21220230043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3172484.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21220230043 its reverse (34003202212), we get a palindrome (55223432255).

The spelling of 21220230043 in words is "twenty-one billion, two hundred twenty million, two hundred thirty thousand, forty-three".