12021515 has 16 divisors (see below), whose sum is σ = 16282080. Its totient is φ = 8440320.

The previous prime is 12021491. The next prime is 12021539. The reversal of 12021515 is 51512021.

It is an interprime number because it is at equal distance from previous prime (12021491) and next prime (12021539).

It is not a de Polignac number, because 12021515 - 2⁸ = 12021259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021493 and 12021502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2174 + ... + 5363.

It is an arithmetic number, because the mean of its divisors is an integer number (1017630).

Almost surely, 2^12021515 is an apocalyptic number.

12021515 is a deficient number, since it is larger than the sum of its proper divisors (4260565).

12021515 is a wasteful number, since it uses less digits than its factorization.

12021515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7582.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 12021515 is about 3467.2056472035. The cubic root of 12021515 is about 229.0795919696.

Adding to 12021515 its reverse (51512021), we get a palindrome (63533536).

The spelling of 12021515 in words is "twelve million, twenty-one thousand, five hundred fifteen".