21124004142 has 16 divisors (see below), whose sum is σ = 42757021440. Its totient is φ = 6956499192.

The previous prime is 21124004141. The next prime is 21124004197. The reversal of 21124004142 is 24140042112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124004141) 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 7 ways as a sum of consecutive naturals, for example, 21208342 + ... + 21209337.

It is an arithmetic number, because the mean of its divisors is an integer number (2672313840).

Almost surely, 2^21124004142 is an apocalyptic number.

21124004142 is an abundant number, since it is smaller than the sum of its proper divisors (21633017298).

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

21124004142 is a wasteful number, since it uses less digits than its factorization.

21124004142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42417767.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21124004142 its reverse (24140042112), we get a palindrome (45264046254).

The spelling of 21124004142 in words is "twenty-one billion, one hundred twenty-four million, four thousand, one hundred forty-two".