21011823593 has 2 divisors, whose sum is σ = 21011823594. Its totient is φ = 21011823592.

The previous prime is 21011823571. The next prime is 21011823617. The reversal of 21011823593 is 39532811012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15409001689 + 5602821904 = 124133^2 + 74852^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011823593 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011823893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505911796 + 10505911797.

It is an arithmetic number, because the mean of its divisors is an integer number (10505911797).

Almost surely, 2^21011823593 is an apocalyptic number.

It is an amenable number.

21011823593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011823593 is an equidigital number, since it uses as much as digits as its factorization.

21011823593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 21011823593 in words is "twenty-one billion, eleven million, eight hundred twenty-three thousand, five hundred ninety-three".