21503822123 has 8 divisors (see below), whose sum is σ = 24942600192. Its totient is φ = 18156744936.

The previous prime is 21503822077. The next prime is 21503822149. The reversal of 21503822123 is 32122830512.

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 21503822123 - 2¹⁰ = 21503821099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21503822623) 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, 22924715 + ... + 22925652.

It is an arithmetic number, because the mean of its divisors is an integer number (3117825024).

Almost surely, 2^21503822123 is an apocalyptic number.

21503822123 is a deficient number, since it is larger than the sum of its proper divisors (3438778069).

21503822123 is an equidigital number, since it uses as much as digits as its factorization.

21503822123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45850441.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21503822123 in words is "twenty-one billion, five hundred three million, eight hundred twenty-two thousand, one hundred twenty-three".