21435512968793 has 16 divisors (see below), whose sum is σ = 26729762417280. Its totient is φ = 16699892726400.

The previous prime is 21435512968789. The next prime is 21435512968823. The reversal of 21435512968793 is 39786921553412.

It is a cyclic number.

It is not a de Polignac number, because 21435512968793 - 2² = 21435512968789 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21435512968783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25452908 + ... + 26281581.

It is an arithmetic number, because the mean of its divisors is an integer number (1670610151080).

Almost surely, 2^{21435512968793} is an apocalyptic number.

It is an amenable number.

21435512968793 is a deficient number, since it is larger than the sum of its proper divisors (5294249448487).

21435512968793 is a wasteful number, since it uses less digits than its factorization.

21435512968793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51739888.

The product of its digits is 97977600, while the sum is 65.

The spelling of 21435512968793 in words is "twenty-one trillion, four hundred thirty-five billion, five hundred twelve million, nine hundred sixty-eight thousand, seven hundred ninety-three".