21244124142 has 48 divisors (see below), whose sum is σ = 46324711680. Its totient is φ = 7036016400.

The previous prime is 21244124131. The next prime is 21244124177. The reversal of 21244124142 is 24142144212.

21244124142 is a `hidden beast` number, since 2 + 1 + 244 + 1 + 2 + 414 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1843017 + ... + 1854507.

It is an arithmetic number, because the mean of its divisors is an integer number (965098160).

Almost surely, 2^21244124142 is an apocalyptic number.

21244124142 is an abundant number, since it is smaller than the sum of its proper divisors (25080587538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21244124142 is a wasteful number, since it uses less digits than its factorization.

21244124142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12149 (or 12146 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

Adding to 21244124142 its reverse (24142144212), we get a palindrome (45386268354).

The spelling of 21244124142 in words is "twenty-one billion, two hundred forty-four million, one hundred twenty-four thousand, one hundred forty-two".