12735921 has 16 divisors (see below), whose sum is σ = 18643968. Its totient is φ = 7669200.

The previous prime is 12735913. The next prime is 12735923. The reversal of 12735921 is 12953721.

It is not a de Polignac number, because 12735921 - 2³ = 12735913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12735923) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4356 + ... + 6666.

It is an arithmetic number, because the mean of its divisors is an integer number (1165248).

Almost surely, 2^12735921 is an apocalyptic number.

12735921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12735921 is a deficient number, since it is larger than the sum of its proper divisors (5908047).

12735921 is a wasteful number, since it uses less digits than its factorization.

12735921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2492.

The product of its digits is 3780, while the sum is 30.

The square root of 12735921 is about 3568.7422154031. The cubic root of 12735921 is about 233.5304155761.

The spelling of 12735921 in words is "twelve million, seven hundred thirty-five thousand, nine hundred twenty-one".