21773696 has 64 divisors (see below), whose sum is σ = 52224000. Its totient is φ = 8833536.

The previous prime is 21773683. The next prime is 21773701. The reversal of 21773696 is 69637712.

It is a tau number, because it is divible by the number of its divisors (64).

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, 16385 + ... + 17663.

It is an arithmetic number, because the mean of its divisors is an integer number (816000).

Almost surely, 2^21773696 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 21773696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26112000).

21773696 is an abundant number, since it is smaller than the sum of its proper divisors (30450304).

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

21773696 is a wasteful number, since it uses less digits than its factorization.

21773696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319 (or 1307 counting only the distinct ones).

The product of its digits is 95256, while the sum is 41.

The square root of 21773696 is about 4666.2293128392. The cubic root of 21773696 is about 279.2398429195.

The spelling of 21773696 in words is "twenty-one million, seven hundred seventy-three thousand, six hundred ninety-six".