21424013142 has 96 divisors (see below), whose sum is σ = 50467380480. Its totient is φ = 6044875200.

The previous prime is 21424013119. The next prime is 21424013167. The reversal of 21424013142 is 24131042412.

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 47 ways as a sum of consecutive naturals, for example, 16241959 + ... + 16243277.

It is an arithmetic number, because the mean of its divisors is an integer number (525701880).

Almost surely, 2^21424013142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21424013142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25233690240).

21424013142 is an abundant number, since it is smaller than the sum of its proper divisors (29043367338).

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

21424013142 is a wasteful number, since it uses less digits than its factorization.

21424013142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986 (or 1979 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21424013142 its reverse (24131042412), we get a palindrome (45555055554).

The spelling of 21424013142 in words is "twenty-one billion, four hundred twenty-four million, thirteen thousand, one hundred forty-two".