12002181 has 8 divisors (see below), whose sum is σ = 16020384. Its totient is φ = 7992720.

The previous prime is 12002173. The next prime is 12002183. The reversal of 12002181 is 18120021.

12002181 is digitally balanced in base 2 and base 4, because in such bases 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 12002181 - 2³ = 12002173 is a prime.

It is a super-2 number, since 2×12002181² = 288104697513522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12002181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12002183) 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, 2391 + ... + 5451.

It is an arithmetic number, because the mean of its divisors is an integer number (2002548).

Almost surely, 2^12002181 is an apocalyptic number.

It is an amenable number.

12002181 is a deficient number, since it is larger than the sum of its proper divisors (4018203).

12002181 is a wasteful number, since it uses less digits than its factorization.

12002181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4371.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 12002181 is about 3464.4164010696. The cubic root of 12002181 is about 228.9567177914.

The spelling of 12002181 in words is "twelve million, two thousand, one hundred eighty-one".