21184252136 has 16 divisors (see below), whose sum is σ = 39722019300. Its totient is φ = 10591713664.

The previous prime is 21184252129. The next prime is 21184252147. The reversal of 21184252136 is 63125248112.

It can be written as a sum of positive squares in 2 ways, for example, as 19826329636 + 1357922500 = 140806^2 + 36850^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21184252096 and 21184252105.

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 3 ways as a sum of consecutive naturals, for example, 360470 + ... + 415098.

Almost surely, 2^21184252136 is an apocalyptic number.

It is an amenable number.

21184252136 is a deficient number, since it is larger than the sum of its proper divisors (18537767164).

21184252136 is a wasteful number, since it uses less digits than its factorization.

21184252136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103108 (or 103104 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The spelling of 21184252136 in words is "twenty-one billion, one hundred eighty-four million, two hundred fifty-two thousand, one hundred thirty-six".