20323216213453 has 2 divisors, whose sum is σ = 20323216213454. Its totient is φ = 20323216213452.

The previous prime is 20323216213303. The next prime is 20323216213493. The reversal of 20323216213453 is 35431261232302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12363922640169 + 7959293573284 = 3516237^2 + 2821222^2 .

It is a cyclic number.

It is not a de Polignac number, because 20323216213453 - 2¹⁷ = 20323216082381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20323216213493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161608106726 + 10161608106727.

It is an arithmetic number, because the mean of its divisors is an integer number (10161608106727).

Almost surely, 2^{20323216213453} is an apocalyptic number.

It is an amenable number.

20323216213453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323216213453 is an equidigital number, since it uses as much as digits as its factorization.

20323216213453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 37.

Adding to 20323216213453 its reverse (35431261232302), we get a palindrome (55754477445755).

The spelling of 20323216213453 in words is "twenty trillion, three hundred twenty-three billion, two hundred sixteen million, two hundred thirteen thousand, four hundred fifty-three".