12905221 has 8 divisors (see below), whose sum is σ = 14991104. Its totient is φ = 10879920.

The previous prime is 12905219. The next prime is 12905251. The reversal of 12905221 is 12250921.

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 12905221 - 2¹ = 12905219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12905192 and 12905201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12905251) 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, 14685 + ... + 15538.

It is an arithmetic number, because the mean of its divisors is an integer number (1873888).

Almost surely, 2^12905221 is an apocalyptic number.

It is an amenable number.

12905221 is a deficient number, since it is larger than the sum of its proper divisors (2085883).

12905221 is an equidigital number, since it uses as much as digits as its factorization.

12905221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30291.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 12905221 is about 3592.3837489890. The cubic root of 12905221 is about 234.5606458258.

The spelling of 12905221 in words is "twelve million, nine hundred five thousand, two hundred twenty-one".