21103100124 has 12 divisors (see below), whose sum is σ = 49240566984. Its totient is φ = 7034366704.

The previous prime is 21103100113. The next prime is 21103100141. The reversal of 21103100124 is 42100130112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879295827 + ... + 879295850.

It is an arithmetic number, because the mean of its divisors is an integer number (4103380582).

Almost surely, 2^21103100124 is an apocalyptic number.

It is an amenable number.

21103100124 is an abundant number, since it is smaller than the sum of its proper divisors (28137466860).

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

21103100124 is a wasteful number, since it uses less digits than its factorization.

21103100124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758591684 (or 1758591682 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21103100124 its reverse (42100130112), we get a palindrome (63203230236).

The spelling of 21103100124 in words is "twenty-one billion, one hundred three million, one hundred thousand, one hundred twenty-four".