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12000221 = 103116507
BaseRepresentation
bin101101110001…
…101111011101
3211120200012122
4231301233131
511033001341
61105112325
7204000032
oct55615735
924520178
1012000221
116856a42
1240286a5
13264212c
141845389
1510c094b
hexb71bdd

12000221 has 4 divisors (see below), whose sum is σ = 12116832. Its totient is φ = 11883612.

The previous prime is 12000133. The next prime is 12000239. The reversal of 12000221 is 12200021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12200021 = 52323327.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-12000221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12000199 and 12000208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58151 + ... + 58356.

It is an arithmetic number, because the mean of its divisors is an integer number (3029208).

Almost surely, 212000221 is an apocalyptic number.

It is an amenable number.

12000221 is a deficient number, since it is larger than the sum of its proper divisors (116611).

12000221 is a wasteful number, since it uses less digits than its factorization.

12000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116610.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 12000221 is about 3464.1335135933. The cubic root of 12000221 is about 228.9442539567.

Adding to 12000221 its reverse (12200021), we get a palindrome (24200242).

It can be divided in two parts, 12000 and 221, that added together give a palindrome (12221).

The spelling of 12000221 in words is "twelve million, two hundred twenty-one", and thus it is an aban number.

Divisors: 1 103 116507 12000221