121212353 has 4 divisors (see below), whose sum is σ = 121236420. Its totient is φ = 121188288.

The previous prime is 121212349. The next prime is 121212361. The reversal of 121212353 is 353212121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56055169 + 65157184 = 7487^2 + 8072^2 .

It is a cyclic number.

It is not a de Polignac number, because 121212353 - 2² = 121212349 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121212383) 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, 1268 + ... + 15621.

It is an arithmetic number, because the mean of its divisors is an integer number (30309105).

Almost surely, 2^121212353 is an apocalyptic number.

It is an amenable number.

121212353 is a deficient number, since it is larger than the sum of its proper divisors (24067).

121212353 is an equidigital number, since it uses as much as digits as its factorization.

121212353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24066.

The product of its digits is 360, while the sum is 20.

The square root of 121212353 is about 11009.6481778484. The cubic root of 121212353 is about 494.8979186157.

Adding to 121212353 its reverse (353212121), we get a palindrome (474424474).

The spelling of 121212353 in words is "one hundred twenty-one million, two hundred twelve thousand, three hundred fifty-three".