21111041124 has 48 divisors (see below), whose sum is σ = 54961401600. Its totient is φ = 7007561568.

The previous prime is 21111041111. The next prime is 21111041131. The reversal of 21111041124 is 42114011112.

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 = 21111041097 and 21111041106.

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, 383127 + ... + 434750.

It is an arithmetic number, because the mean of its divisors is an integer number (1145029200).

Almost surely, 2^21111041124 is an apocalyptic number.

It is an amenable number.

21111041124 is an abundant number, since it is smaller than the sum of its proper divisors (33850360476).

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

21111041124 is a wasteful number, since it uses less digits than its factorization.

21111041124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818129 (or 818121 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21111041124 its reverse (42114011112), we get a palindrome (63225052236).

The spelling of 21111041124 in words is "twenty-one billion, one hundred eleven million, forty-one thousand, one hundred twenty-four".