12121308 has 18 divisors (see below), whose sum is σ = 30640064. Its totient is φ = 4040424.

The previous prime is 12121303. The next prime is 12121309. The reversal of 12121308 is 80312121.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×12121308² = 293852215261728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 168316 + ... + 168387.

Almost surely, 2^12121308 is an apocalyptic number.

12121308 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12121308 is an abundant number, since it is smaller than the sum of its proper divisors (18518756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12121308 is a wasteful number, since it uses less digits than its factorization.

12121308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336713 (or 336708 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12121308 is about 3481.5668886293. The cubic root of 12121308 is about 229.7117245309.

Adding to 12121308 its reverse (80312121), we get a palindrome (92433429).

The spelling of 12121308 in words is "twelve million, one hundred twenty-one thousand, three hundred eight".