21243143111 has 8 divisors (see below), whose sum is σ = 22521066624. Its totient is φ = 20002260960.

The previous prime is 21243142997. The next prime is 21243143123. The reversal of 21243143111 is 11134134212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21243143111 - 2²² = 21238948807 is a prime.

It is a super-2 number, since 2×21243143111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243140111) 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 7 ways as a sum of consecutive naturals, for example, 9259160 + ... + 9261453.

It is an arithmetic number, because the mean of its divisors is an integer number (2815133328).

Almost surely, 2^21243143111 is an apocalyptic number.

21243143111 is a deficient number, since it is larger than the sum of its proper divisors (1277923513).

21243143111 is a wasteful number, since it uses less digits than its factorization.

21243143111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18520681.

The product of its digits is 576, while the sum is 23.

Adding to 21243143111 its reverse (11134134212), we get a palindrome (32377277323).

The spelling of 21243143111 in words is "twenty-one billion, two hundred forty-three million, one hundred forty-three thousand, one hundred eleven".