21236454135 has 48 divisors (see below), whose sum is σ = 39711672000. Its totient is φ = 10436332032.

The previous prime is 21236454131. The next prime is 21236454157. The reversal of 21236454135 is 53145463212.

21236454135 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 645 + 4 + 1 + 3 + 5 = 666.

It is not a de Polignac number, because 21236454135 - 2² = 21236454131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21236454135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236454131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 300966 + ... + 364764.

It is an arithmetic number, because the mean of its divisors is an integer number (827326500).

Almost surely, 2^21236454135 is an apocalyptic number.

21236454135 is a deficient number, since it is larger than the sum of its proper divisors (18475217865).

21236454135 is a wasteful number, since it uses less digits than its factorization.

21236454135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64392 (or 64389 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 21236454135 in words is "twenty-one billion, two hundred thirty-six million, four hundred fifty-four thousand, one hundred thirty-five".