354112212121 has 4 divisors (see below), whose sum is σ = 354279801652. Its totient is φ = 353944622592.

The previous prime is 354112212109. The next prime is 354112212161. The reversal of 354112212121 is 121212211453.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121212211453 = 653 ⋅185623601.

It can be written as a sum of positive squares in 2 ways, for example, as 26082250000 + 328029962121 = 161500^2 + 572739^2 .

It is a cyclic number.

It is not a de Polignac number, because 354112212121 - 2¹⁷ = 354112081049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (354112212161) 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, 83791596 + ... + 83795821.

It is an arithmetic number, because the mean of its divisors is an integer number (88569950413).

Almost surely, 2^354112212121 is an apocalyptic number.

It is an amenable number.

354112212121 is a deficient number, since it is larger than the sum of its proper divisors (167589531).

354112212121 is a wasteful number, since it uses less digits than its factorization.

354112212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167589530.

The product of its digits is 960, while the sum is 25.

Adding to 354112212121 its reverse (121212211453), we get a palindrome (475324423574).

The spelling of 354112212121 in words is "three hundred fifty-four billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-one".