21112120044 has 48 divisors (see below), whose sum is σ = 54747433440. Its totient is φ = 7035791040.

The previous prime is 21112120027. The next prime is 21112120063. The reversal of 21112120044 is 44002121112.

It is a super-2 number, since 2×21112120044² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21112119999 and 21112120026.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522802 + ... + 561734.

It is an arithmetic number, because the mean of its divisors is an integer number (1140571530).

Almost surely, 2^21112120044 is an apocalyptic number.

It is an amenable number.

21112120044 is an abundant number, since it is smaller than the sum of its proper divisors (33635313396).

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

21112120044 is a wasteful number, since it uses less digits than its factorization.

21112120044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43967 (or 43959 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21112120044 its reverse (44002121112), we get a palindrome (65114241156).

The spelling of 21112120044 in words is "twenty-one billion, one hundred twelve million, one hundred twenty thousand, forty-four".