12771421 has 8 divisors (see below), whose sum is σ = 13881560. Its totient is φ = 11679552.

The previous prime is 12771419. The next prime is 12771431. The reversal of 12771421 is 12417721.

It can be written as a sum of positive squares in 4 ways, for example, as 972196 + 11799225 = 986^2 + 3435^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12771421 - 2¹ = 12771419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12771431) 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 7 ways as a sum of consecutive naturals, for example, 3090 + ... + 5923.

It is an arithmetic number, because the mean of its divisors is an integer number (1735195).

Almost surely, 2^12771421 is an apocalyptic number.

It is an amenable number.

12771421 is a deficient number, since it is larger than the sum of its proper divisors (1110139).

12771421 is a wasteful number, since it uses less digits than its factorization.

12771421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9135.

The product of its digits is 784, while the sum is 25.

The square root of 12771421 is about 3573.7124954310. The cubic root of 12771421 is about 233.7471945291.

The spelling of 12771421 in words is "twelve million, seven hundred seventy-one thousand, four hundred twenty-one".