355220121 has 4 divisors (see below), whose sum is σ = 473626832. Its totient is φ = 236813412.

The previous prime is 355220113. The next prime is 355220137. The reversal of 355220121 is 121022553.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 355220121 - 2³ = 355220113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (355220191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59203351 + ... + 59203356.

It is an arithmetic number, because the mean of its divisors is an integer number (118406708).

Almost surely, 2^355220121 is an apocalyptic number.

It is an amenable number.

355220121 is a deficient number, since it is larger than the sum of its proper divisors (118406711).

355220121 is a wasteful number, since it uses less digits than its factorization.

355220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118406710.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 355220121 is about 18847.2841810166. The cubic root of 355220121 is about 708.2161932735.

Adding to 355220121 its reverse (121022553), we get a palindrome (476242674).

The spelling of 355220121 in words is "three hundred fifty-five million, two hundred twenty thousand, one hundred twenty-one".