21212323743593 has 2 divisors, whose sum is σ = 21212323743594. Its totient is φ = 21212323743592.

The previous prime is 21212323743521. The next prime is 21212323743599. The reversal of 21212323743593 is 39534732321212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20976839682304 + 235484061289 = 4580048^2 + 485267^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212323743593 - 2²⁰ = 21212322695017 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212323743599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606161871796 + 10606161871797.

It is an arithmetic number, because the mean of its divisors is an integer number (10606161871797).

Almost surely, 2^{21212323743593} is an apocalyptic number.

It is an amenable number.

21212323743593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212323743593 is an equidigital number, since it uses as much as digits as its factorization.

21212323743593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 47.

The spelling of 21212323743593 in words is "twenty-one trillion, two hundred twelve billion, three hundred twenty-three million, seven hundred forty-three thousand, five hundred ninety-three".