12721553 has 16 divisors (see below), whose sum is σ = 14439936. Its totient is φ = 11119680.

The previous prime is 12721549. The next prime is 12721601. The reversal of 12721553 is 35512721.

It is not a de Polignac number, because 12721553 - 2² = 12721549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12721523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46808 + ... + 47078.

It is an arithmetic number, because the mean of its divisors is an integer number (902496).

Almost surely, 2^12721553 is an apocalyptic number.

12721553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12721553 is a deficient number, since it is larger than the sum of its proper divisors (1718383).

12721553 is a wasteful number, since it uses less digits than its factorization.

12721553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464.

The product of its digits is 2100, while the sum is 26.

The square root of 12721553 is about 3566.7286131692. The cubic root of 12721553 is about 233.4425635973.

The spelling of 12721553 in words is "twelve million, seven hundred twenty-one thousand, five hundred fifty-three".