12271821 has 8 divisors (see below), whose sum is σ = 16400064. Its totient is φ = 8162400.

The previous prime is 12271801. The next prime is 12271837. The reversal of 12271821 is 12817221.

12271821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12271821 - 2⁶ = 12271757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12271791 and 12271800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12271801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3105 + ... + 5846.

It is an arithmetic number, because the mean of its divisors is an integer number (2050008).

Almost surely, 2^12271821 is an apocalyptic number.

It is an amenable number.

12271821 is a deficient number, since it is larger than the sum of its proper divisors (4128243).

12271821 is an equidigital number, since it uses as much as digits as its factorization.

12271821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9411.

The product of its digits is 448, while the sum is 24.

The square root of 12271821 is about 3503.1158987393. The cubic root of 12271821 is about 230.6586100501.

The spelling of 12271821 in words is "twelve million, two hundred seventy-one thousand, eight hundred twenty-one".