21100124 has 12 divisors (see below), whose sum is σ = 36960504. Its totient is φ = 10539984.

The previous prime is 21100103. The next prime is 21100129. The reversal of 21100124 is 42100112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4154 + ... + 7710.

It is an arithmetic number, because the mean of its divisors is an integer number (3080042).

Almost surely, 2^21100124 is an apocalyptic number.

It is an amenable number.

21100124 is a deficient number, since it is larger than the sum of its proper divisors (15860380).

21100124 is a wasteful number, since it uses less digits than its factorization.

21100124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5044 (or 5042 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21100124 is about 4593.4871285332. The cubic root of 21100124 is about 276.3301901337.

Adding to 21100124 its reverse (42100112), we get a palindrome (63200236).

The spelling of 21100124 in words is "twenty-one million, one hundred thousand, one hundred twenty-four".