12721755 has 16 divisors (see below), whose sum is σ = 20401920. Its totient is φ = 6769248.

The previous prime is 12721739. The next prime is 12721771. The reversal of 12721755 is 55712721.

12721755 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12721739) and next prime (12721771).

It is not a de Polignac number, because 12721755 - 2⁴ = 12721739 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8986 + ... + 10304.

It is an arithmetic number, because the mean of its divisors is an integer number (1275120).

Almost surely, 2^12721755 is an apocalyptic number.

12721755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12721755 is a deficient number, since it is larger than the sum of its proper divisors (7680165).

12721755 is a wasteful number, since it uses less digits than its factorization.

12721755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970.

The product of its digits is 4900, while the sum is 30.

The square root of 12721755 is about 3566.7569303220. The cubic root of 12721755 is about 233.4437991684.

The spelling of 12721755 in words is "twelve million, seven hundred twenty-one thousand, seven hundred fifty-five".