21303122123 has 4 divisors (see below), whose sum is σ = 22229344848. Its totient is φ = 20376899400.

The previous prime is 21303122119. The next prime is 21303122167. The reversal of 21303122123 is 32122130312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21303122123 - 2² = 21303122119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21303122095 and 21303122104.

It is not an unprimeable number, because it can be changed into a prime (21303122173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463111328 + ... + 463111373.

It is an arithmetic number, because the mean of its divisors is an integer number (5557336212).

Almost surely, 2^21303122123 is an apocalyptic number.

21303122123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21303122123 is a deficient number, since it is larger than the sum of its proper divisors (926222725).

21303122123 is an equidigital number, since it uses as much as digits as its factorization.

21303122123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926222724.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21303122123 its reverse (32122130312), we get a palindrome (53425252435).

The spelling of 21303122123 in words is "twenty-one billion, three hundred three million, one hundred twenty-two thousand, one hundred twenty-three".