21111003311124 has 12 divisors (see below), whose sum is σ = 49259007725984. Its totient is φ = 7037001103704.

The previous prime is 21111003311087. The next prime is 21111003311129. The reversal of 21111003311124 is 42111330011112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21111003311124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111003311129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879625137952 + ... + 879625137975.

Almost surely, 2^{21111003311124} is an apocalyptic number.

It is an amenable number.

21111003311124 is an abundant number, since it is smaller than the sum of its proper divisors (28148004414860).

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

21111003311124 is a wasteful number, since it uses less digits than its factorization.

21111003311124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759250275934 (or 1759250275932 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21111003311124 its reverse (42111330011112), we get a palindrome (63222333322236).

The spelling of 21111003311124 in words is "twenty-one trillion, one hundred eleven billion, three million, three hundred eleven thousand, one hundred twenty-four".