355221234121 has 16 divisors (see below), whose sum is σ = 405199733904. Its totient is φ = 308493379584.

The previous prime is 355221234107. The next prime is 355221234127. The reversal of 355221234121 is 121432122553.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 25015850896 + 330205383225 = 158164^2 + 574635^2 .

It is not a de Polignac number, because 355221234121 - 2²⁵ = 355187679689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (355221234127) 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, 296725 + ... + 893581.

It is an arithmetic number, because the mean of its divisors is an integer number (25324983369).

Almost surely, 2^355221234121 is an apocalyptic number.

It is an amenable number.

355221234121 is a deficient number, since it is larger than the sum of its proper divisors (49978499783).

355221234121 is a wasteful number, since it uses less digits than its factorization.

355221234121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599580.

The product of its digits is 14400, while the sum is 31.

Adding to 355221234121 its reverse (121432122553), we get a palindrome (476653356674).

The spelling of 355221234121 in words is "three hundred fifty-five billion, two hundred twenty-one million, two hundred thirty-four thousand, one hundred twenty-one".