21233003123 has 4 divisors (see below), whose sum is σ = 21233879328. Its totient is φ = 21232126920.

The previous prime is 21233003119. The next prime is 21233003137. The reversal of 21233003123 is 32130033212.

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 21233003123 - 2² = 21233003119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233003095 and 21233003104.

It is not an unprimeable number, because it can be changed into a prime (21233003023) 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, 400688 + ... + 450573.

It is an arithmetic number, because the mean of its divisors is an integer number (5308469832).

Almost surely, 2^21233003123 is an apocalyptic number.

21233003123 is a deficient number, since it is larger than the sum of its proper divisors (876205).

21233003123 is an equidigital number, since it uses as much as digits as its factorization.

21233003123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876204.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21233003123 its reverse (32130033212), we get a palindrome (53363036335).

The spelling of 21233003123 in words is "twenty-one billion, two hundred thirty-three million, three thousand, one hundred twenty-three".