21752116 has 6 divisors (see below), whose sum is σ = 38066210. Its totient is φ = 10876056.

The previous prime is 21752113. The next prime is 21752141. The reversal of 21752116 is 61125712.

It can be written as a sum of positive squares in only one way, i.e., 12931216 + 8820900 = 3596^2 + 2970^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21752113) 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 as a sum of consecutive naturals, namely, 2719011 + ... + 2719018.

Almost surely, 2^21752116 is an apocalyptic number.

It is an amenable number.

21752116 is a deficient number, since it is larger than the sum of its proper divisors (16314094).

21752116 is a wasteful number, since it uses less digits than its factorization.

21752116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438033 (or 5438031 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 21752116 is about 4663.9163800394. The cubic root of 21752116 is about 279.1475605052.

Adding to 21752116 its reverse (61125712), we get a palindrome (82877828).

The spelling of 21752116 in words is "twenty-one million, seven hundred fifty-two thousand, one hundred sixteen".