21342143223 has 16 divisors (see below), whose sum is σ = 32637926400. Its totient is φ = 13769124120.

The previous prime is 21342143201. The next prime is 21342143269. The reversal of 21342143223 is 32234124312.

21342143223 is a `hidden beast` number, since 2 + 13 + 421 + 4 + 3 + 223 = 666.

It is not a de Polignac number, because 21342143223 - 2²⁰ = 21341094647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342143423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12748353 + ... + 12750026.

It is an arithmetic number, because the mean of its divisors is an integer number (2039870400).

Almost surely, 2^21342143223 is an apocalyptic number.

21342143223 is a deficient number, since it is larger than the sum of its proper divisors (11295783177).

21342143223 is a wasteful number, since it uses less digits than its factorization.

21342143223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25498419 (or 25498413 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21342143223 its reverse (32234124312), we get a palindrome (53576267535).

The spelling of 21342143223 in words is "twenty-one billion, three hundred forty-two million, one hundred forty-three thousand, two hundred twenty-three".