21135506463 has 12 divisors (see below), whose sum is σ = 32135858040. Its totient is φ = 13348740816.

The previous prime is 21135506429. The next prime is 21135506527. The reversal of 21135506463 is 36460553112.

21135506463 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 5 + 5 + 0 + 646 + 3 = 666.

It is not a de Polignac number, because 21135506463 - 2²⁰ = 21134457887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135506423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61799556 + ... + 61799897.

It is an arithmetic number, because the mean of its divisors is an integer number (2677988170).

Almost surely, 2^21135506463 is an apocalyptic number.

21135506463 is a deficient number, since it is larger than the sum of its proper divisors (11000351577).

21135506463 is a wasteful number, since it uses less digits than its factorization.

21135506463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123599478 (or 123599475 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 21135506463 in words is "twenty-one billion, one hundred thirty-five million, five hundred six thousand, four hundred sixty-three".