15445254013221 has 16 divisors (see below), whose sum is σ = 21843026979840. Its totient is φ = 9680432402160.

The previous prime is 15445254013199. The next prime is 15445254013289. The reversal of 15445254013221 is 12231045254451.

It is not a de Polignac number, because 15445254013221 - 2¹⁹ = 15445253488933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15445254013221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15445254013421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1034226765 + ... + 1034241698.

It is an arithmetic number, because the mean of its divisors is an integer number (1365189186240).

Almost surely, 2^{15445254013221} is an apocalyptic number.

It is an amenable number.

15445254013221 is a deficient number, since it is larger than the sum of its proper divisors (6397772966619).

15445254013221 is a wasteful number, since it uses less digits than its factorization.

15445254013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068468616.

The product of its (nonzero) digits is 192000, while the sum is 39.

Adding to 15445254013221 its reverse (12231045254451), we get a palindrome (27676299267672).

The spelling of 15445254013221 in words is "fifteen trillion, four hundred forty-five billion, two hundred fifty-four million, thirteen thousand, two hundred twenty-one".