Search a number
12102121 = 31390391
BaseRepresentation
bin101110001010…
…100111101001
3211202211222201
4232022213221
511044231441
61111220201
7204603103
oct56124751
924684881
1012102121
116916559
124077661
132679625
141870573
1510e0c31
hexb8a9e9

12102121 has 4 divisors (see below), whose sum is σ = 12492544. Its totient is φ = 11711700.

The previous prime is 12102091. The next prime is 12102127. The reversal of 12102121 is 12120121.

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: 12120121 = 13932317.

It is a cyclic number.

It is not a de Polignac number, because 12102121 - 215 = 12069353 is a prime.

It is a super-2 number, since 2×121021212 = 292922665397282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102098 and 12102107.

It is not an unprimeable number, because it can be changed into a prime (12102127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195165 + ... + 195226.

It is an arithmetic number, because the mean of its divisors is an integer number (3123136).

Almost surely, 212102121 is an apocalyptic number.

It is an amenable number.

12102121 is a deficient number, since it is larger than the sum of its proper divisors (390423).

12102121 is an equidigital number, since it uses as much as digits as its factorization.

12102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390422.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 12102121 is about 3478.8102851406. The cubic root of 12102121 is about 229.5904558125.

Adding to 12102121 its reverse (12120121), we get a palindrome (24222242).

The spelling of 12102121 in words is "twelve million, one hundred two thousand, one hundred twenty-one".

Divisors: 1 31 390391 12102121