12121156 has 6 divisors (see below), whose sum is σ = 21212030. Its totient is φ = 6060576.

The previous prime is 12121147. The next prime is 12121157. The reversal of 12121156 is 65112121.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 1032256 = 3330^2 + 1016^2 .

It is not an unprimeable number, because it can be changed into a prime (12121157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1515141 + ... + 1515148.

Almost surely, 2^12121156 is an apocalyptic number.

It is an amenable number.

12121156 is a deficient number, since it is larger than the sum of its proper divisors (9090874).

12121156 is a wasteful number, since it uses less digits than its factorization.

12121156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030293 (or 3030291 counting only the distinct ones).

The product of its digits is 120, while the sum is 19.

The square root of 12121156 is about 3481.5450593092. The cubic root of 12121156 is about 229.7107643395.

Adding to 12121156 its reverse (65112121), we get a palindrome (77233277).

It can be divided in two parts, 1212115 and 6, that added together give a palindrome (1212121).

The spelling of 12121156 in words is "twelve million, one hundred twenty-one thousand, one hundred fifty-six".