12151521 has 24 divisors (see below), whose sum is σ = 18720000. Its totient is φ = 7577856.

The previous prime is 12151511. The next prime is 12151523. The reversal of 12151521 is 12515121.

12151521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12151521 - 2¹⁵ = 12118753 is a prime.

It is a super-2 number, since 2×12151521² = 295318925226882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12151494 and 12151503.

It is not an unprimeable number, because it can be changed into a prime (12151523) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9105 + ... + 10353.

It is an arithmetic number, because the mean of its divisors is an integer number (780000).

Almost surely, 2^12151521 is an apocalyptic number.

It is an amenable number.

12151521 is a deficient number, since it is larger than the sum of its proper divisors (6568479).

12151521 is a wasteful number, since it uses less digits than its factorization.

12151521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325 (or 1322 counting only the distinct ones).

The product of its digits is 100, while the sum is 18.

The square root of 12151521 is about 3485.9031828208. The cubic root of 12151521 is about 229.9024223766.

Adding to 12151521 its reverse (12515121), we get a palindrome (24666642).

The spelling of 12151521 in words is "twelve million, one hundred fifty-one thousand, five hundred twenty-one".