21233012123 has 4 divisors (see below), whose sum is σ = 21328227648. Its totient is φ = 21137796600.

The previous prime is 21233012027. The next prime is 21233012131. The reversal of 21233012123 is 32121033212.

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 21233012123 - 2¹⁴ = 21232995739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233012095 and 21233012104.

It is not an unprimeable number, because it can be changed into a prime (21233012023) 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, 47607428 + ... + 47607873.

It is an arithmetic number, because the mean of its divisors is an integer number (5332056912).

Almost surely, 2^21233012123 is an apocalyptic number.

21233012123 is a deficient number, since it is larger than the sum of its proper divisors (95215525).

21233012123 is an equidigital number, since it uses as much as digits as its factorization.

21233012123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95215524.

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

Adding to 21233012123 its reverse (32121033212), we get a palindrome (53354045335).

The spelling of 21233012123 in words is "twenty-one billion, two hundred thirty-three million, twelve thousand, one hundred twenty-three".