21263124364535 has 4 divisors (see below), whose sum is σ = 25515749237448. Its totient is φ = 17010499491624.

The previous prime is 21263124364499. The next prime is 21263124364543. The reversal of 21263124364535 is 53546342136212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21263124364535 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21263124364535.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2126312436449 + ... + 2126312436458.

It is an arithmetic number, because the mean of its divisors is an integer number (6378937309362).

Almost surely, 2^{21263124364535} is an apocalyptic number.

21263124364535 is a deficient number, since it is larger than the sum of its proper divisors (4252624872913).

21263124364535 is an equidigital number, since it uses as much as digits as its factorization.

21263124364535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252624872912.

The product of its digits is 3110400, while the sum is 47.

The spelling of 21263124364535 in words is "twenty-one trillion, two hundred sixty-three billion, one hundred twenty-four million, three hundred sixty-four thousand, five hundred thirty-five".