21110124 has 48 divisors (see below), whose sum is σ = 59609088. Its totient is φ = 5676288.

The previous prime is 21110123. The next prime is 21110129. The reversal of 21110124 is 42101112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21110123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5964 + ... + 8819.

It is an arithmetic number, because the mean of its divisors is an integer number (1241856).

Almost surely, 2^21110124 is an apocalyptic number.

It is an amenable number.

21110124 is an abundant number, since it is smaller than the sum of its proper divisors (38498964).

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

21110124 is a wasteful number, since it uses less digits than its factorization.

21110124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14814 (or 14812 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 21110124 is about 4594.5754972576. The cubic root of 21110124 is about 276.3738370411.

Adding to 21110124 its reverse (42101112), we get a palindrome (63211236).

The spelling of 21110124 in words is "twenty-one million, one hundred ten thousand, one hundred twenty-four".