121353212321 has 4 divisors (see below), whose sum is σ = 132385322544. Its totient is φ = 110321102100.

The previous prime is 121353212311. The next prime is 121353212333. The reversal of 121353212321 is 123212353121.

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 121353212321 - 2⁶ = 121353212257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121353212311) 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, 5516055095 + ... + 5516055116.

It is an arithmetic number, because the mean of its divisors is an integer number (33096330636).

Almost surely, 2^121353212321 is an apocalyptic number.

121353212321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121353212321 is a deficient number, since it is larger than the sum of its proper divisors (11032110223).

121353212321 is a wasteful number, since it uses less digits than its factorization.

121353212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11032110222.

The product of its digits is 2160, while the sum is 26.

Adding to 121353212321 its reverse (123212353121), we get a palindrome (244565565442).

The spelling of 121353212321 in words is "one hundred twenty-one billion, three hundred fifty-three million, two hundred twelve thousand, three hundred twenty-one".