21313352453 has 2 divisors, whose sum is σ = 21313352454. Its totient is φ = 21313352452.

The previous prime is 21313352443. The next prime is 21313352491. The reversal of 21313352453 is 35425331312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12987337444 + 8326015009 = 113962^2 + 91247^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313352453 - 2¹⁰ = 21313351429 is a prime.

It is a super-2 number, since 2×21313352453² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313352413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656676226 + 10656676227.

It is an arithmetic number, because the mean of its divisors is an integer number (10656676227).

Almost surely, 2^21313352453 is an apocalyptic number.

It is an amenable number.

21313352453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313352453 is an equidigital number, since it uses as much as digits as its factorization.

21313352453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 32.

Adding to 21313352453 its reverse (35425331312), we get a palindrome (56738683765).

The spelling of 21313352453 in words is "twenty-one billion, three hundred thirteen million, three hundred fifty-two thousand, four hundred fifty-three".