21233313123 has 64 divisors (see below), whose sum is σ = 33179134464. Its totient is φ = 11936000000.

The previous prime is 21233313109. The next prime is 21233313131. The reversal of 21233313123 is 32131333212.

It is a cyclic number.

It is not a de Polignac number, because 21233313123 - 2¹⁴ = 21233296739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21233313093 and 21233313102.

It is not an unprimeable number, because it can be changed into a prime (21233313103) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14221165 + ... + 14222657.

It is an arithmetic number, because the mean of its divisors is an integer number (518423976).

Almost surely, 2^21233313123 is an apocalyptic number.

21233313123 is a deficient number, since it is larger than the sum of its proper divisors (11945821341).

21233313123 is a wasteful number, since it uses less digits than its factorization.

21233313123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876.

The product of its digits is 1944, while the sum is 24.

Adding to 21233313123 its reverse (32131333212), we get a palindrome (53364646335).

It can be divided in two parts, 212333 and 13123, that added together give a triangular number (225456 = T₆₇₁).

The spelling of 21233313123 in words is "twenty-one billion, two hundred thirty-three million, three hundred thirteen thousand, one hundred twenty-three".