15447213713121 has 128 divisors (see below), whose sum is σ = 23112135475200. Its totient is φ = 9132593184000.

The previous prime is 15447213713033. The next prime is 15447213713153. The reversal of 15447213713121 is 12131731274451.

It is not a de Polignac number, because 15447213713121 - 2¹¹ = 15447213711073 is a prime.

It is a super-2 number, since 2×15447213713121² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15447213723121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6862377246 + ... + 6862379496.

It is an arithmetic number, because the mean of its divisors is an integer number (180563558400).

Almost surely, 2^{15447213713121} is an apocalyptic number.

It is an amenable number.

15447213713121 is a deficient number, since it is larger than the sum of its proper divisors (7664921762079).

15447213713121 is a wasteful number, since it uses less digits than its factorization.

15447213713121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931.

The product of its digits is 141120, while the sum is 42.

Adding to 15447213713121 its reverse (12131731274451), we get a palindrome (27578944987572).

The spelling of 15447213713121 in words is "fifteen trillion, four hundred forty-seven billion, two hundred thirteen million, seven hundred thirteen thousand, one hundred twenty-one".