21124642112 has 56 divisors (see below), whose sum is σ = 47921631360. Its totient is φ = 9050780160.

The previous prime is 21124642087. The next prime is 21124642117.

21124642112 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124642117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2980589 + ... + 2987667.

Almost surely, 2^21124642112 is an apocalyptic number.

It is an amenable number.

21124642112 is an abundant number, since it is smaller than the sum of its proper divisors (26796989248).

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

21124642112 is an equidigital number, since it uses as much as digits as its factorization.

21124642112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13759 (or 13749 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The spelling of 21124642112 in words is "twenty-one billion, one hundred twenty-four million, six hundred forty-two thousand, one hundred twelve".