205535143033221 has 16 divisors (see below), whose sum is σ = 279878106046464. Its totient is φ = 134107814031024.

The previous prime is 205535143033219. The next prime is 205535143033261. The reversal of 205535143033221 is 122330341535502.

It is not a de Polignac number, because 205535143033221 - 2¹ = 205535143033219 is a prime.

It is a super-2 number, since 2×205535143033221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205535143033221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205535143033261) 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, 159614676 + ... + 160897218.

It is an arithmetic number, because the mean of its divisors is an integer number (17492381627904).

Almost surely, 2^{205535143033221} is an apocalyptic number.

It is an amenable number.

205535143033221 is a deficient number, since it is larger than the sum of its proper divisors (74342963013243).

205535143033221 is a wasteful number, since it uses less digits than its factorization.

205535143033221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419160.

The product of its (nonzero) digits is 324000, while the sum is 39.

Adding to 205535143033221 its reverse (122330341535502), we get a palindrome (327865484568723).

The spelling of 205535143033221 in words is "two hundred five trillion, five hundred thirty-five billion, one hundred forty-three million, thirty-three thousand, two hundred twenty-one".