21110311321044 has 96 divisors (see below), whose sum is σ = 53978501799936. Its totient is φ = 6368122702080.

The previous prime is 21110311321027. The next prime is 21110311321093. The reversal of 21110311321044 is 44012311301112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 282613069 + ... + 282687755.

It is an arithmetic number, because the mean of its divisors is an integer number (562276060416).

Almost surely, 2^{21110311321044} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110311321044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26989250899968).

21110311321044 is an abundant number, since it is smaller than the sum of its proper divisors (32868190478892).

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

21110311321044 is a wasteful number, since it uses less digits than its factorization.

21110311321044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84365 (or 84363 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 21110311321044 its reverse (44012311301112), we get a palindrome (65122622622156).

The spelling of 21110311321044 in words is "twenty-one trillion, one hundred ten billion, three hundred eleven million, three hundred twenty-one thousand, forty-four".