12755421 has 16 divisors (see below), whose sum is σ = 21596800. Its totient is φ = 7288704.

The previous prime is 12755411. The next prime is 12755429. The reversal of 12755421 is 12455721.

12755421 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 not a de Polignac number, because 12755421 - 2¹⁴ = 12739037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12755429) 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, 33556 + ... + 33933.

It is an arithmetic number, because the mean of its divisors is an integer number (1349800).

Almost surely, 2^12755421 is an apocalyptic number.

It is an amenable number.

12755421 is a deficient number, since it is larger than the sum of its proper divisors (8841379).

12755421 is an equidigital number, since it uses as much as digits as its factorization.

12755421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67505 (or 67499 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 12755421 is about 3571.4732254351. The cubic root of 12755421 is about 233.6495411304.

The spelling of 12755421 in words is "twelve million, seven hundred fifty-five thousand, four hundred twenty-one".