21336436652 has 6 divisors (see below), whose sum is σ = 37338764148. Its totient is φ = 10668218324.

The previous prime is 21336436637. The next prime is 21336436661. The reversal of 21336436652 is 25663463312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2667054578 + ... + 2667054585.

It is an arithmetic number, because the mean of its divisors is an integer number (6223127358).

Almost surely, 2^21336436652 is an apocalyptic number.

It is an amenable number.

21336436652 is a deficient number, since it is larger than the sum of its proper divisors (16002327496).

21336436652 is a wasteful number, since it uses less digits than its factorization.

21336436652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5334109167 (or 5334109165 counting only the distinct ones).

The product of its digits is 466560, while the sum is 41.

Adding to 21336436652 its reverse (25663463312), we get a palindrome (46999899964).

The spelling of 21336436652 in words is "twenty-one billion, three hundred thirty-six million, four hundred thirty-six thousand, six hundred fifty-two".