21044023342 has 16 divisors (see below), whose sum is σ = 34238054592. Its totient is φ = 9661530880.

The previous prime is 21044023331. The next prime is 21044023369. The reversal of 21044023342 is 24332044012.

It is a happy number.

It is a congruent number.

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, 7546678 + ... + 7549465.

It is an arithmetic number, because the mean of its divisors is an integer number (2139878412).

Almost surely, 2^21044023342 is an apocalyptic number.

21044023342 is a deficient number, since it is larger than the sum of its proper divisors (13194031250).

21044023342 is a wasteful number, since it uses less digits than its factorization.

21044023342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15096203.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21044023342 its reverse (24332044012), we get a palindrome (45376067354).

The spelling of 21044023342 in words is "twenty-one billion, forty-four million, twenty-three thousand, three hundred forty-two".