21433352123 has 4 divisors (see below), whose sum is σ = 22694137560. Its totient is φ = 20172566688.

The previous prime is 21433352081. The next prime is 21433352147. The reversal of 21433352123 is 32125333412.

It is a happy number.

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 21433352123 - 2¹⁴ = 21433335739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21433352183) 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, 630392693 + ... + 630392726.

It is an arithmetic number, because the mean of its divisors is an integer number (5673534390).

Almost surely, 2^21433352123 is an apocalyptic number.

21433352123 is a deficient number, since it is larger than the sum of its proper divisors (1260785437).

21433352123 is a wasteful number, since it uses less digits than its factorization.

21433352123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260785436.

The product of its digits is 12960, while the sum is 29.

Adding to 21433352123 its reverse (32125333412), we get a palindrome (53558685535).

The spelling of 21433352123 in words is "twenty-one billion, four hundred thirty-three million, three hundred fifty-two thousand, one hundred twenty-three".