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12102221 = 194314813
BaseRepresentation
bin101110001010…
…101001001101
3211202212010102
4232022221031
511044232341
61111220445
7204603305
oct56125115
924685112
1012102221
11691663a
124077725
1326796a1
141870605
1510e0c9b
hexb8aa4d

12102221 has 8 divisors (see below), whose sum is σ = 13036320. Its totient is φ = 11197872.

The previous prime is 12102199. The next prime is 12102239. The reversal of 12102221 is 12220121.

It is a happy number.

12102221 is digitally balanced in base 2, because in such base 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 a cyclic number.

It is not a de Polignac number, because 12102221 - 26 = 12102157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102241) 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, 6590 + ... + 8223.

It is an arithmetic number, because the mean of its divisors is an integer number (1629540).

Almost surely, 212102221 is an apocalyptic number.

It is an amenable number.

12102221 is a deficient number, since it is larger than the sum of its proper divisors (934099).

12102221 is a wasteful number, since it uses less digits than its factorization.

12102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14875.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 12102221 is about 3478.8246578406. The cubic root of 12102221 is about 229.5910881805.

Adding to 12102221 its reverse (12220121), we get a palindrome (24322342).

The spelling of 12102221 in words is "twelve million, one hundred two thousand, two hundred twenty-one".

Divisors: 1 19 43 817 14813 281447 636959 12102221