21124200112 has 20 divisors (see below), whose sum is σ = 41290337160. Its totient is φ = 10468629248.

The previous prime is 21124200101. The next prime is 21124200121. The reversal of 21124200112 is 21100242112.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5840062 + ... + 5843677.

It is an arithmetic number, because the mean of its divisors is an integer number (2064516858).

Almost surely, 2^21124200112 is an apocalyptic number.

It is an amenable number.

21124200112 is a deficient number, since it is larger than the sum of its proper divisors (20166137048).

21124200112 is a wasteful number, since it uses less digits than its factorization.

21124200112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11683860 (or 11683854 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21124200112 its reverse (21100242112), we get a palindrome (42224442224).

The spelling of 21124200112 in words is "twenty-one billion, one hundred twenty-four million, two hundred thousand, one hundred twelve".