12777121 has 16 divisors (see below), whose sum is σ = 15499008. Its totient is φ = 10296000.

The previous prime is 12777113. The next prime is 12777133. The reversal of 12777121 is 12177721.

12777121 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12777121 - 2³ = 12777113 is a prime.

12777121 is strictly pandigital in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 12777121.

It is not an unprimeable number, because it can be changed into a prime (12777151) 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, 9171 + ... + 10471.

It is an arithmetic number, because the mean of its divisors is an integer number (968688).

Almost surely, 2^12777121 is an apocalyptic number.

It is an amenable number.

12777121 is a deficient number, since it is larger than the sum of its proper divisors (2721887).

12777121 is a wasteful number, since it uses less digits than its factorization.

12777121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392.

The product of its digits is 1372, while the sum is 28.

The square root of 12777121 is about 3574.5098964753. The cubic root of 12777121 is about 233.7819638484.

The spelling of 12777121 in words is "twelve million, seven hundred seventy-seven thousand, one hundred twenty-one".