21424140042 has 16 divisors (see below), whose sum is σ = 45103452960. Its totient is φ = 6765517872.

The previous prime is 21424140037. The next prime is 21424140077. The reversal of 21424140042 is 24004142412.

It is a junction number, because it is equal to n+sod(n) for n = 21424139994 and 21424140021.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93965413 + ... + 93965640.

It is an arithmetic number, because the mean of its divisors is an integer number (2818965810).

Almost surely, 2^21424140042 is an apocalyptic number.

21424140042 is an abundant number, since it is smaller than the sum of its proper divisors (23679312918).

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

21424140042 is a wasteful number, since it uses less digits than its factorization.

21424140042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187931077.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21424140042 its reverse (24004142412), we get a palindrome (45428282454).

The spelling of 21424140042 in words is "twenty-one billion, four hundred twenty-four million, one hundred forty thousand, forty-two".