121243213 has 8 divisors (see below), whose sum is σ = 149222528. Its totient is φ = 95928624.

The previous prime is 121243193. The next prime is 121243223. The reversal of 121243213 is 312342121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121243213 - 2¹³ = 121235021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121243223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666081 + ... + 666262.

It is an arithmetic number, because the mean of its divisors is an integer number (18652816).

Almost surely, 2^121243213 is an apocalyptic number.

121243213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121243213 is a deficient number, since it is larger than the sum of its proper divisors (27979315).

121243213 is a wasteful number, since it uses less digits than its factorization.

121243213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332363.

The product of its digits is 288, while the sum is 19.

The square root of 121243213 is about 11011.0495866652. The cubic root of 121243213 is about 494.9399144835.

Adding to 121243213 its reverse (312342121), we get a palindrome (433585334).

It can be divided in two parts, 12124321 and 3, that added together give a square (12124324 = 3482²).

The spelling of 121243213 in words is "one hundred twenty-one million, two hundred forty-three thousand, two hundred thirteen".