12721550 has 48 divisors (see below), whose sum is σ = 24862992. Its totient is φ = 4838400.

The previous prime is 12721549. The next prime is 12721601. The reversal of 12721550 is 5512721.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131102 + ... + 131198.

It is an arithmetic number, because the mean of its divisors is an integer number (517979).

Almost surely, 2^12721550 is an apocalyptic number.

12721550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12721550 is a deficient number, since it is larger than the sum of its proper divisors (12141442).

12721550 is a wasteful number, since it uses less digits than its factorization.

12721550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 12721550 is about 3566.7281926157. The cubic root of 12721550 is about 233.4425452472.

The spelling of 12721550 in words is "twelve million, seven hundred twenty-one thousand, five hundred fifty".