21112344442 has 16 divisors (see below), whose sum is σ = 36213420672. Its totient is φ = 9042940080.

The previous prime is 21112344371. The next prime is 21112344443. The reversal of 21112344442 is 24444321112.

It is a self number, because there is not a number n which added to its sum of digits gives 21112344442.

It is not an unprimeable number, because it can be changed into a prime (21112344443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408718 + ... + 457465.

It is an arithmetic number, because the mean of its divisors is an integer number (2263338792).

Almost surely, 2^21112344442 is an apocalyptic number.

21112344442 is a deficient number, since it is larger than the sum of its proper divisors (15101076230).

21112344442 is a wasteful number, since it uses less digits than its factorization.

21112344442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867933.

The product of its digits is 6144, while the sum is 28.

Adding to 21112344442 its reverse (24444321112), we get a palindrome (45556665554).

The spelling of 21112344442 in words is "twenty-one billion, one hundred twelve million, three hundred forty-four thousand, four hundred forty-two".