21135309336 has 48 divisors (see below), whose sum is σ = 57620574960. Its totient is φ = 6998443200.

The previous prime is 21135309329. The next prime is 21135309343. The reversal of 21135309336 is 63390353112.

21135309336 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 530 + 93 + 36 = 666.

It is an interprime number because it is at equal distance from previous prime (21135309329) and next prime (21135309343).

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 21135309336.

It is a congruent number.

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, 961135 + ... + 982878.

It is an arithmetic number, because the mean of its divisors is an integer number (1200428645).

Almost surely, 2^21135309336 is an apocalyptic number.

It is an amenable number.

21135309336 is an abundant number, since it is smaller than the sum of its proper divisors (36485265624).

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

21135309336 is a wasteful number, since it uses less digits than its factorization.

21135309336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944176 (or 1944169 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 36.

The spelling of 21135309336 in words is "twenty-one billion, one hundred thirty-five million, three hundred nine thousand, three hundred thirty-six".