21124100123 has 8 divisors (see below), whose sum is σ = 24194200800. Its totient is φ = 18067092480.

The previous prime is 21124100113. The next prime is 21124100141. The reversal of 21124100123 is 32100142112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21124100123 - 2¹⁸ = 21123837979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21124100113) 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, 3269798 + ... + 3276251.

It is an arithmetic number, because the mean of its divisors is an integer number (3024275100).

Almost surely, 2^21124100123 is an apocalyptic number.

21124100123 is a deficient number, since it is larger than the sum of its proper divisors (3070100677).

21124100123 is an equidigital number, since it uses as much as digits as its factorization.

21124100123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6546517.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21124100123 its reverse (32100142112), we get a palindrome (53224242235).

The spelling of 21124100123 in words is "twenty-one billion, one hundred twenty-four million, one hundred thousand, one hundred twenty-three".