21313430233 has 16 divisors (see below), whose sum is σ = 22206885120. Its totient is φ = 20441558016.

The previous prime is 21313430207. The next prime is 21313430249. The reversal of 21313430233 is 33203431312.

It is a cyclic number.

It is not a de Polignac number, because 21313430233 - 2¹³ = 21313422041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21313430198 and 21313430207.

It is not an unprimeable number, because it can be changed into a prime (21313430293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590223 + ... + 625291.

It is an arithmetic number, because the mean of its divisors is an integer number (1387930320).

Almost surely, 2^21313430233 is an apocalyptic number.

It is an amenable number.

21313430233 is a deficient number, since it is larger than the sum of its proper divisors (893454887).

21313430233 is a wasteful number, since it uses less digits than its factorization.

21313430233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35376.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 21313430233 its reverse (33203431312), we get a palindrome (54516861545).

The spelling of 21313430233 in words is "twenty-one billion, three hundred thirteen million, four hundred thirty thousand, two hundred thirty-three".