21124042112 has 32 divisors (see below), whose sum is σ = 42183120000. Its totient is φ = 10536906240.

The previous prime is 21124042097. The next prime is 21124042117.

21124042112 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124042117) 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, 142112 + ... + 249887.

It is an arithmetic number, because the mean of its divisors is an integer number (1318222500).

Almost surely, 2^21124042112 is an apocalyptic number.

It is an amenable number.

21124042112 is a deficient number, since it is larger than the sum of its proper divisors (21059077888).

21124042112 is an equidigital number, since it uses as much as digits as its factorization.

21124042112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392434 (or 392422 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

It can be divided in two parts, 211240 and 42112, that added together give a palindrome (253352).

The spelling of 21124042112 in words is "twenty-one billion, one hundred twenty-four million, forty-two thousand, one hundred twelve".