12002221 has 32 divisors (see below), whose sum is σ = 16236288. Its totient is φ = 8586240.

The previous prime is 12002213. The next prime is 12002231. The reversal of 12002221 is 12220021.

It is a cyclic number.

It is not a de Polignac number, because 12002221 - 2³ = 12002213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12002198 and 12002207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12002231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69291 + ... + 69463.

It is an arithmetic number, because the mean of its divisors is an integer number (507384).

Almost surely, 2^12002221 is an apocalyptic number.

12002221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12002221 is a deficient number, since it is larger than the sum of its proper divisors (4234067).

12002221 is a wasteful number, since it uses less digits than its factorization.

12002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 12002221 is about 3464.4221740429. The cubic root of 12002221 is about 228.9569721412.

Adding to 12002221 its reverse (12220021), we get a palindrome (24222242).

The spelling of 12002221 in words is "twelve million, two thousand, two hundred twenty-one".