21034440042 has 32 divisors (see below), whose sum is σ = 52449513984. Its totient is φ = 5463490800.

The previous prime is 21034439963. The next prime is 21034440059. The reversal of 21034440042 is 24004443012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21034439994 and 21034440021.

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, 22764084 + ... + 22765007.

It is an arithmetic number, because the mean of its divisors is an integer number (1639047312).

Almost surely, 2^21034440042 is an apocalyptic number.

21034440042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21034440042 is an abundant number, since it is smaller than the sum of its proper divisors (31415073942).

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

21034440042 is a wasteful number, since it uses less digits than its factorization.

21034440042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45529114.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21034440042 its reverse (24004443012), we get a palindrome (45038883054).

The spelling of 21034440042 in words is "twenty-one billion, thirty-four million, four hundred forty thousand, forty-two".