21789696 has 88 divisors (see below), whose sum is σ = 59837904. Its totient is φ = 7045120.

The previous prime is 21789689. The next prime is 21789709. The reversal of 21789696 is 69698712.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125866 + ... + 126038.

Almost surely, 2^21789696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21789696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29918952).

21789696 is an abundant number, since it is smaller than the sum of its proper divisors (38048208).

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

21789696 is a wasteful number, since it uses less digits than its factorization.

21789696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 219 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The square root of 21789696 is about 4667.9434443875. The cubic root of 21789696 is about 279.3082242601.

The spelling of 21789696 in words is "twenty-one million, seven hundred eighty-nine thousand, six hundred ninety-six".