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12120121 = 13932317
BaseRepresentation
bin101110001111…
…000000111001
3211210202200101
4232033000321
511100320441
61111435401
7205006426
oct56170071
924722611
1012120121
116929032
124085b61
132684890
141876d4d
1510e6231
hexb8f039

12120121 has 4 divisors (see below), whose sum is σ = 13052452. Its totient is φ = 11187792.

The previous prime is 12120091. The next prime is 12120179. The reversal of 12120121 is 12102121.

12120121 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12102121 = 31390391.

It can be written as a sum of positive squares in 2 ways, for example, as 6574096 + 5546025 = 2564^2 + 2355^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120121 - 25 = 12120089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120098 and 12120107.

It is not an unprimeable number, because it can be changed into a prime (12120181) 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, 466146 + ... + 466171.

It is an arithmetic number, because the mean of its divisors is an integer number (3263113).

Almost surely, 212120121 is an apocalyptic number.

It is an amenable number.

12120121 is a deficient number, since it is larger than the sum of its proper divisors (932331).

12120121 is an equidigital number, since it uses as much as digits as its factorization.

12120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932330.

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

The square root of 12120121 is about 3481.3964152334. The cubic root of 12120121 is about 229.7042259805.

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

The spelling of 12120121 in words is "twelve million, one hundred twenty thousand, one hundred twenty-one".

Divisors: 1 13 932317 12120121