21135530376 has 48 divisors (see below), whose sum is σ = 58322110860. Its totient is φ = 6912247680.

The previous prime is 21135530333. The next prime is 21135530389. The reversal of 21135530376 is 67303553112.

21135530376 is a `hidden beast` number, since 2 + 113 + 5 + 530 + 3 + 7 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18200708100 + 2934822276 = 134910^2 + 54174^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21135530376.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2765515 + ... + 2773146.

Almost surely, 2^21135530376 is an apocalyptic number.

It is an amenable number.

21135530376 is an abundant number, since it is smaller than the sum of its proper divisors (37186580484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21135530376 is a wasteful number, since it uses less digits than its factorization.

21135530376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5538726 (or 5538719 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 36.

The spelling of 21135530376 in words is "twenty-one billion, one hundred thirty-five million, five hundred thirty thousand, three hundred seventy-six".