12201381 has 8 divisors (see below), whose sum is σ = 18076160. Its totient is φ = 8134236.

The previous prime is 12201367. The next prime is 12201407. The reversal of 12201381 is 18310221.

12201381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12201381 - 2¹¹ = 12199333 is a prime.

It is a super-2 number, since 2×12201381² = 297747396614322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225925 + ... + 225978.

It is an arithmetic number, because the mean of its divisors is an integer number (2259520).

Almost surely, 2^12201381 is an apocalyptic number.

It is an amenable number.

12201381 is a deficient number, since it is larger than the sum of its proper divisors (5874779).

12201381 is an equidigital number, since it uses as much as digits as its factorization.

12201381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451912 (or 451906 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12201381 is about 3493.0475232954. The cubic root of 12201381 is about 230.2164377228.

It can be divided in two parts, 1220 and 1381, that added together give a square (2601 = 51²).

The spelling of 12201381 in words is "twelve million, two hundred one thousand, three hundred eighty-one".