21869688 has 32 divisors (see below), whose sum is σ = 57052800. Its totient is φ = 6972768.

The previous prime is 21869677. The next prime is 21869689. The reversal of 21869688 is 88696812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19258 + ... + 20361.

It is an arithmetic number, because the mean of its divisors is an integer number (1782900).

Almost surely, 2^21869688 is an apocalyptic number.

It is an amenable number.

21869688 is an abundant number, since it is smaller than the sum of its proper divisors (35183112).

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

21869688 is a wasteful number, since it uses less digits than its factorization.

21869688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39651 (or 39647 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The square root of 21869688 is about 4676.5038223014. The cubic root of 21869688 is about 279.6495956852.

The spelling of 21869688 in words is "twenty-one million, eight hundred sixty-nine thousand, six hundred eighty-eight".