121221512 has 16 divisors (see below), whose sum is σ = 228269340. Its totient is φ = 60349696.

The previous prime is 121221497. The next prime is 121221521. The reversal of 121221512 is 215122121.

It can be written as a sum of positive squares in 2 ways, for example, as 119814916 + 1406596 = 10946^2 + 1186^2 .

It is a super-2 number, since 2×121221512² = 29389309943132288, which contains 22 as substring.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30653 + ... + 34380.

Almost surely, 2^121221512 is an apocalyptic number.

It is an amenable number.

121221512 is a deficient number, since it is larger than the sum of its proper divisors (107047828).

121221512 is a wasteful number, since it uses less digits than its factorization.

121221512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65272 (or 65268 counting only the distinct ones).

The product of its digits is 80, while the sum is 17.

The square root of 121221512 is about 11010.0641233373. The cubic root of 121221512 is about 494.9103833955.

Adding to 121221512 its reverse (215122121), we get a palindrome (336343633).

The spelling of 121221512 in words is "one hundred twenty-one million, two hundred twenty-one thousand, five hundred twelve".