21105734463 has 40 divisors (see below), whose sum is σ = 35580592080. Its totient is φ = 12350257920.

The previous prime is 21105734459. The next prime is 21105734473. The reversal of 21105734463 is 36443750112.

21105734463 is a `hidden beast` number, since 2 + 110 + 57 + 34 + 463 = 666.

It is not a de Polignac number, because 21105734463 - 2² = 21105734459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105734473) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 382570 + ... + 434247.

It is an arithmetic number, because the mean of its divisors is an integer number (889514802).

Almost surely, 2^21105734463 is an apocalyptic number.

21105734463 is a deficient number, since it is larger than the sum of its proper divisors (14474857617).

21105734463 is a wasteful number, since it uses less digits than its factorization.

21105734463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816869 (or 816860 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 21105734463 in words is "twenty-one billion, one hundred five million, seven hundred thirty-four thousand, four hundred sixty-three".