15855035338221 has 16 divisors (see below), whose sum is σ = 21656867012928. Its totient is φ = 10311642396800.

The previous prime is 15855035338189. The next prime is 15855035338243. The reversal of 15855035338221 is 12283353055851.

It is a cyclic number.

It is not a de Polignac number, because 15855035338221 - 2⁵ = 15855035338189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15855035338291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1380495 + ... + 5797916.

It is an arithmetic number, because the mean of its divisors is an integer number (1353554188308).

Almost surely, 2^{15855035338221} is an apocalyptic number.

It is an amenable number.

15855035338221 is a deficient number, since it is larger than the sum of its proper divisors (5801831674707).

15855035338221 is a wasteful number, since it uses less digits than its factorization.

15855035338221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7196412.

The product of its (nonzero) digits is 4320000, while the sum is 51.

The spelling of 15855035338221 in words is "fifteen trillion, eight hundred fifty-five billion, thirty-five million, three hundred thirty-eight thousand, two hundred twenty-one".