21736548252 has 18 divisors (see below), whose sum is σ = 54945163728. Its totient is φ = 7245516072.

The previous prime is 21736548227. The next prime is 21736548269. The reversal of 21736548252 is 25284563712.

21736548252 is a `hidden beast` number, since 21 + 7 + 36 + 548 + 2 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21736548198 and 21736548207.

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 301896468 + ... + 301896539.

It is an arithmetic number, because the mean of its divisors is an integer number (3052509096).

Almost surely, 2^21736548252 is an apocalyptic number.

It is an amenable number.

21736548252 is an abundant number, since it is smaller than the sum of its proper divisors (33208615476).

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

21736548252 is a wasteful number, since it uses less digits than its factorization.

21736548252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603793017 (or 603793012 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 21736548252 in words is "twenty-one billion, seven hundred thirty-six million, five hundred forty-eight thousand, two hundred fifty-two".