21231043142 has 8 divisors (see below), whose sum is σ = 31847940936. Its totient is φ = 10615062832.

The previous prime is 21231043109. The next prime is 21231043157. The reversal of 21231043142 is 24134013212.

21231043142 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168263 + ... + 266034.

It is an arithmetic number, because the mean of its divisors is an integer number (3980992617).

Almost surely, 2^21231043142 is an apocalyptic number.

21231043142 is a deficient number, since it is larger than the sum of its proper divisors (10616897794).

21231043142 is a wasteful number, since it uses less digits than its factorization.

21231043142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458742.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21231043142 its reverse (24134013212), we get a palindrome (45365056354).

The spelling of 21231043142 in words is "twenty-one billion, two hundred thirty-one million, forty-three thousand, one hundred forty-two".