21424044142 has 8 divisors (see below), whose sum is σ = 32919872832. Its totient is φ = 10450753200.

The previous prime is 21424044139. The next prime is 21424044167. The reversal of 21424044142 is 24144042412.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21424044142.

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, 130634334 + ... + 130634497.

It is an arithmetic number, because the mean of its divisors is an integer number (4114984104).

Almost surely, 2^21424044142 is an apocalyptic number.

21424044142 is a deficient number, since it is larger than the sum of its proper divisors (11495828690).

21424044142 is a wasteful number, since it uses less digits than its factorization.

21424044142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261268874.

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 21424044142 its reverse (24144042412), we get a palindrome (45568086554).

The spelling of 21424044142 in words is "twenty-one billion, four hundred twenty-four million, forty-four thousand, one hundred forty-two".