121321213 has 12 divisors (see below), whose sum is σ = 138289440. Its totient is φ = 106091856.

The previous prime is 121321177. The next prime is 121321229. The reversal of 121321213 is 312123121.

It is not a de Polignac number, because 121321213 - 2¹³ = 121313021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15681 + ... + 22102.

It is an arithmetic number, because the mean of its divisors is an integer number (11524120).

Almost surely, 2^121321213 is an apocalyptic number.

121321213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121321213 is a deficient number, since it is larger than the sum of its proper divisors (16968227).

121321213 is a wasteful number, since it uses less digits than its factorization.

121321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37828 (or 37815 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 121321213 is about 11014.5909138742. The cubic root of 121321213 is about 495.0460291177.

Adding to 121321213 its reverse (312123121), we get a palindrome (433444334).

The spelling of 121321213 in words is "one hundred twenty-one million, three hundred twenty-one thousand, two hundred thirteen".