355021855221 has 16 divisors (see below), whose sum is σ = 517090475520. Its totient is φ = 214875156720.

The previous prime is 355021855207. The next prime is 355021855267. The reversal of 355021855221 is 122558120553.

It is not a de Polignac number, because 355021855221 - 2¹⁰ = 355021854197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 355021855221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355021855621) 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, 7215211 + ... + 7264248.

It is an arithmetic number, because the mean of its divisors is an integer number (32318154720).

Almost surely, 2^355021855221 is an apocalyptic number.

It is an amenable number.

355021855221 is a deficient number, since it is larger than the sum of its proper divisors (162068620299).

355021855221 is a wasteful number, since it uses less digits than its factorization.

355021855221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14480216.

The product of its (nonzero) digits is 120000, while the sum is 39.

Adding to 355021855221 its reverse (122558120553), we get a palindrome (477579975774).

The spelling of 355021855221 in words is "three hundred fifty-five billion, twenty-one million, eight hundred fifty-five thousand, two hundred twenty-one".