21263612535436 has 24 divisors (see below), whose sum is σ = 38035506087936. Its totient is φ = 10396711437840.

The previous prime is 21263612535433. The next prime is 21263612535439. The reversal of 21263612535436 is 63453521636212.

It is an interprime number because it is at equal distance from previous prime (21263612535433) and next prime (21263612535439).

It is a self number, because there is not a number n which added to its sum of digits gives 21263612535436.

It is not an unprimeable number, because it can be changed into a prime (21263612535433) 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 7 ways as a sum of consecutive naturals, for example, 48073756 + ... + 48514051.

It is an arithmetic number, because the mean of its divisors is an integer number (1584812753664).

Almost surely, 2^{21263612535436} is an apocalyptic number.

It is an amenable number.

21263612535436 is a deficient number, since it is larger than the sum of its proper divisors (16771893552500).

21263612535436 is a wasteful number, since it uses less digits than its factorization.

21263612535436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96589029 (or 96589027 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 49.

The spelling of 21263612535436 in words is "twenty-one trillion, two hundred sixty-three billion, six hundred twelve million, five hundred thirty-five thousand, four hundred thirty-six".