12221621515 has 16 divisors (see below), whose sum is σ = 15115989600. Its totient is φ = 9479151360.

The previous prime is 12221621513. The next prime is 12221621519. The reversal of 12221621515 is 51512612221.

12221621515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12221621515 - 2¹ = 12221621513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12221621513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65565 + ... + 169534.

It is an arithmetic number, because the mean of its divisors is an integer number (944749350).

Almost surely, 2^12221621515 is an apocalyptic number.

12221621515 is a deficient number, since it is larger than the sum of its proper divisors (2894368085).

12221621515 is a wasteful number, since it uses less digits than its factorization.

12221621515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235422.

The product of its digits is 2400, while the sum is 28.

The spelling of 12221621515 in words is "twelve billion, two hundred twenty-one million, six hundred twenty-one thousand, five hundred fifteen".