21431120223 has 4 divisors (see below), whose sum is σ = 28574826968. Its totient is φ = 14287413480.

The previous prime is 21431120171. The next prime is 21431120323. The reversal of 21431120223 is 32202113412.

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

It is not a de Polignac number, because 21431120223 - 2¹² = 21431116127 is a prime.

It is a super-3 number, since 3×21431120223³ (a number of 32 digits) contains 333 as substring.

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 21431120223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431120323) 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, 3571853368 + ... + 3571853373.

It is an arithmetic number, because the mean of its divisors is an integer number (7143706742).

Almost surely, 2^21431120223 is an apocalyptic number.

21431120223 is a deficient number, since it is larger than the sum of its proper divisors (7143706745).

21431120223 is an equidigital number, since it uses as much as digits as its factorization.

21431120223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7143706744.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21431120223 its reverse (32202113412), we get a palindrome (53633233635).

The spelling of 21431120223 in words is "twenty-one billion, four hundred thirty-one million, one hundred twenty thousand, two hundred twenty-three".