21233123293 has 4 divisors (see below), whose sum is σ = 21238340508. Its totient is φ = 21227906080.

The previous prime is 21233123287. The next prime is 21233123309. The reversal of 21233123293 is 39232133212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8964681124 + 12268442169 = 94682^2 + 110763^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233123293 - 2²⁵ = 21199568861 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233103293) 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, 2602498 + ... + 2610643.

It is an arithmetic number, because the mean of its divisors is an integer number (5309585127).

Almost surely, 2^21233123293 is an apocalyptic number.

It is an amenable number.

21233123293 is a deficient number, since it is larger than the sum of its proper divisors (5217215).

21233123293 is an equidigital number, since it uses as much as digits as its factorization.

21233123293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5217214.

The product of its digits is 11664, while the sum is 31.

The spelling of 21233123293 in words is "twenty-one billion, two hundred thirty-three million, one hundred twenty-three thousand, two hundred ninety-three".