21302315233 has 4 divisors (see below), whose sum is σ = 21302988480. Its totient is φ = 21301641988.

The previous prime is 21302315189. The next prime is 21302315249. The reversal of 21302315233 is 33251320312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302315233 is a prime.

It is a super-2 number, since 2×21302315233² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302315198 and 21302315207.

It is not an unprimeable number, because it can be changed into a prime (21302315833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286693 + ... + 353266.

It is an arithmetic number, because the mean of its divisors is an integer number (5325747120).

Almost surely, 2^21302315233 is an apocalyptic number.

It is an amenable number.

21302315233 is a deficient number, since it is larger than the sum of its proper divisors (673247).

21302315233 is an equidigital number, since it uses as much as digits as its factorization.

21302315233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673246.

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 21302315233 its reverse (33251320312), we get a palindrome (54553635545).

The spelling of 21302315233 in words is "twenty-one billion, three hundred two million, three hundred fifteen thousand, two hundred thirty-three".