21233220313 has 2 divisors, whose sum is σ = 21233220314. Its totient is φ = 21233220312.

The previous prime is 21233220299. The next prime is 21233220317. The reversal of 21233220313 is 31302233212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15122358729 + 6110861584 = 122973^2 + 78172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21233220313 is a prime.

It is not a weakly prime, because it can be changed into another prime (21233220317) 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 as a sum of consecutive naturals, namely, 10616610156 + 10616610157.

It is an arithmetic number, because the mean of its divisors is an integer number (10616610157).

Almost surely, 2^21233220313 is an apocalyptic number.

It is an amenable number.

21233220313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233220313 is an equidigital number, since it uses as much as digits as its factorization.

21233220313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21233220313 its reverse (31302233212), we get a palindrome (52535453525).

The spelling of 21233220313 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty thousand, three hundred thirteen".