12121516 has 12 divisors (see below), whose sum is σ = 23141160. Its totient is φ = 5509760.

The previous prime is 12121511. The next prime is 12121517. The reversal of 12121516 is 61512121.

It is a junction number, because it is equal to n+sod(n) for n = 12121493 and 12121502.

It is not an unprimeable number, because it can be changed into a prime (12121511) 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, 137701 + ... + 137788.

It is an arithmetic number, because the mean of its divisors is an integer number (1928430).

Almost surely, 2^12121516 is an apocalyptic number.

It is an amenable number.

12121516 is a deficient number, since it is larger than the sum of its proper divisors (11019644).

12121516 is a wasteful number, since it uses less digits than its factorization.

12121516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275504 (or 275502 counting only the distinct ones).

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

The square root of 12121516 is about 3481.5967601088. The cubic root of 12121516 is about 229.7130384641.

Adding to 12121516 its reverse (61512121), we get a palindrome (73633637).

The spelling of 12121516 in words is "twelve million, one hundred twenty-one thousand, five hundred sixteen".