21033142313 has 2 divisors, whose sum is σ = 21033142314. Its totient is φ = 21033142312.

The previous prime is 21033142297. The next prime is 21033142331. The reversal of 21033142313 is 31324133012.

Together with next prime (21033142331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15567053824 + 5466088489 = 124768^2 + 73933^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033142313 - 2⁴ = 21033142297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21033142513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516571156 + 10516571157.

It is an arithmetic number, because the mean of its divisors is an integer number (10516571157).

Almost surely, 2^21033142313 is an apocalyptic number.

It is an amenable number.

21033142313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033142313 is an equidigital number, since it uses as much as digits as its factorization.

21033142313 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 23.

Adding to 21033142313 its reverse (31324133012), we get a palindrome (52357275325).

The spelling of 21033142313 in words is "twenty-one billion, thirty-three million, one hundred forty-two thousand, three hundred thirteen".