21752696 has 32 divisors (see below), whose sum is σ = 47278080. Its totient is φ = 9189600.

The previous prime is 21752657. The next prime is 21752699. The reversal of 21752696 is 69625712.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21752699) 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, 1241 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (1477440).

Almost surely, 2^21752696 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 21752696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23639040).

21752696 is an abundant number, since it is smaller than the sum of its proper divisors (25525384).

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

21752696 is a wasteful number, since it uses less digits than its factorization.

21752696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555 (or 5551 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 21752696 is about 4663.9785591274. The cubic root of 21752696 is about 279.1500415535.

The spelling of 21752696 in words is "twenty-one million, seven hundred fifty-two thousand, six hundred ninety-six".