21142431223 has 4 divisors (see below), whose sum is σ = 21379986720. Its totient is φ = 20904875728.

The previous prime is 21142431199. The next prime is 21142431229. The reversal of 21142431223 is 32213424112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21142431223 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 (21142431229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118777615 + ... + 118777792.

It is an arithmetic number, because the mean of its divisors is an integer number (5344996680).

Almost surely, 2^21142431223 is an apocalyptic number.

21142431223 is a deficient number, since it is larger than the sum of its proper divisors (237555497).

21142431223 is an equidigital number, since it uses as much as digits as its factorization.

21142431223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237555496.

The product of its digits is 2304, while the sum is 25.

Adding to 21142431223 its reverse (32213424112), we get a palindrome (53355855335).

The spelling of 21142431223 in words is "twenty-one billion, one hundred forty-two million, four hundred thirty-one thousand, two hundred twenty-three".