21442340042 has 32 divisors (see below), whose sum is σ = 34104067200. Its totient is φ = 10089750528.

The previous prime is 21442339979. The next prime is 21442340063. The reversal of 21442340042 is 24004324412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21442339993 and 21442340020.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2859434 + ... + 2866922.

It is an arithmetic number, because the mean of its divisors is an integer number (1065752100).

Almost surely, 2^21442340042 is an apocalyptic number.

21442340042 is a deficient number, since it is larger than the sum of its proper divisors (12661727158).

21442340042 is a wasteful number, since it uses less digits than its factorization.

21442340042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8510.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21442340042 its reverse (24004324412), we get a palindrome (45446664454).

The spelling of 21442340042 in words is "twenty-one billion, four hundred forty-two million, three hundred forty thousand, forty-two".