21253332536 has 32 divisors (see below), whose sum is σ = 39988544400. Its totient is φ = 10589779200.

The previous prime is 21253332533. The next prime is 21253332539. The reversal of 21253332536 is 63523335212.

It is an interprime number because it is at equal distance from previous prime (21253332533) and next prime (21253332539).

It is a junction number, because it is equal to n+sod(n) for n = 21253332496 and 21253332505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253332533) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3660836 + ... + 3666636.

Almost surely, 2^21253332536 is an apocalyptic number.

It is an amenable number.

21253332536 is a deficient number, since it is larger than the sum of its proper divisors (18735211864).

21253332536 is a wasteful number, since it uses less digits than its factorization.

21253332536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7319 (or 7315 counting only the distinct ones).

The product of its digits is 97200, while the sum is 35.

Adding to 21253332536 its reverse (63523335212), we get a palindrome (84776667748).

The spelling of 21253332536 in words is "twenty-one billion, two hundred fifty-three million, three hundred thirty-two thousand, five hundred thirty-six".