12121706 has 4 divisors (see below), whose sum is σ = 18182562. Its totient is φ = 6060852.

The previous prime is 12121699. The next prime is 12121721. The reversal of 12121706 is 60712121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10621081 + 1500625 = 3259^2 + 1225^2 .

It is a super-3 number, since 3×12121706³ (a number of 22 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3030425 + ... + 3030428.

Almost surely, 2^12121706 is an apocalyptic number.

12121706 is a deficient number, since it is larger than the sum of its proper divisors (6060856).

12121706 is an equidigital number, since it uses as much as digits as its factorization.

12121706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6060855.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 12121706 is about 3481.6240463324. The cubic root of 12121706 is about 229.7142386784.

Adding to 12121706 its reverse (60712121), we get a palindrome (72833827).

The spelling of 12121706 in words is "twelve million, one hundred twenty-one thousand, seven hundred six".