21182752 has 12 divisors (see below), whose sum is σ = 41703606. Its totient is φ = 10591360.

The previous prime is 21182741. The next prime is 21182753. The reversal of 21182752 is 25728112.

It can be written as a sum of positive squares in only one way, i.e., 21123216 + 59536 = 4596^2 + 244^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21182752.

It is not an unprimeable number, because it can be changed into a prime (21182753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330949 + ... + 331012.

Almost surely, 2^21182752 is an apocalyptic number.

It is an amenable number.

21182752 is a deficient number, since it is larger than the sum of its proper divisors (20520854).

21182752 is an equidigital number, since it uses as much as digits as its factorization.

21182752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661971 (or 661963 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 21182752 is about 4602.4723790589. The cubic root of 21182752 is about 276.6904229532.

The spelling of 21182752 in words is "twenty-one million, one hundred eighty-two thousand, seven hundred fifty-two".