21788652 has 24 divisors (see below), whose sum is σ = 51021936. Its totient is φ = 7236928.

The previous prime is 21788647. The next prime is 21788653. The reversal of 21788652 is 25688712.

It is a self number, because there is not a number n which added to its sum of digits gives 21788652.

It is not an unprimeable number, because it can be changed into a prime (21788653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418 + ... + 6614.

It is an arithmetic number, because the mean of its divisors is an integer number (2125914).

Almost surely, 2^21788652 is an apocalyptic number.

It is an amenable number.

21788652 is an abundant number, since it is smaller than the sum of its proper divisors (29233284).

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

21788652 is a wasteful number, since it uses less digits than its factorization.

21788652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6497 (or 6495 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 21788652 is about 4667.8316165003. The cubic root of 21788652 is about 279.3037633986.

The spelling of 21788652 in words is "twenty-one million, seven hundred eighty-eight thousand, six hundred fifty-two".