21220233143 has 4 divisors (see below), whose sum is σ = 21426254928. Its totient is φ = 21014211360.

The previous prime is 21220233137. The next prime is 21220233161. The reversal of 21220233143 is 34133202212.

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 21220233143 - 2⁶ = 21220233079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220233943) 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, 103010738 + ... + 103010943.

It is an arithmetic number, because the mean of its divisors is an integer number (5356563732).

Almost surely, 2^21220233143 is an apocalyptic number.

21220233143 is a deficient number, since it is larger than the sum of its proper divisors (206021785).

21220233143 is a wasteful number, since it uses less digits than its factorization.

21220233143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206021784.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21220233143 its reverse (34133202212), we get a palindrome (55353435355).

The spelling of 21220233143 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-three thousand, one hundred forty-three".