12213381 has 16 divisors (see below), whose sum is σ = 16632000. Its totient is φ = 7970688.

The previous prime is 12213353. The next prime is 12213401. The reversal of 12213381 is 18331221.

12213381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12213381 - 2⁶ = 12213317 is a prime.

It is a super-2 number, since 2×12213381² = 298333350902322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213881) 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, 39630 + ... + 39936.

It is an arithmetic number, because the mean of its divisors is an integer number (1039500).

Almost surely, 2^12213381 is an apocalyptic number.

It is an amenable number.

12213381 is a deficient number, since it is larger than the sum of its proper divisors (4418619).

12213381 is a wasteful number, since it uses less digits than its factorization.

12213381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548.

The product of its digits is 288, while the sum is 21.

The square root of 12213381 is about 3494.7647989529. The cubic root of 12213381 is about 230.2918852502.

The spelling of 12213381 in words is "twelve million, two hundred thirteen thousand, three hundred eighty-one".