21263612535345 has 16 divisors (see below), whose sum is σ = 34941287626560. Its totient is φ = 11034090828864.

The previous prime is 21263612535329. The next prime is 21263612535349. The reversal of 21263612535345 is 54353521636212.

It is not a de Polignac number, because 21263612535345 - 2⁴ = 21263612535329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21263612535294 and 21263612535303.

It is not an unprimeable number, because it can be changed into a prime (21263612535349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19156407135 + ... + 19156408244.

It is an arithmetic number, because the mean of its divisors is an integer number (2183830476660).

Almost surely, 2^{21263612535345} is an apocalyptic number.

It is an amenable number.

21263612535345 is a deficient number, since it is larger than the sum of its proper divisors (13677675091215).

21263612535345 is a wasteful number, since it uses less digits than its factorization.

21263612535345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38312815424.

The product of its digits is 3888000, while the sum is 48.

The spelling of 21263612535345 in words is "twenty-one trillion, two hundred sixty-three billion, six hundred twelve million, five hundred thirty-five thousand, three hundred forty-five".