121211231213 has 8 divisors (see below), whose sum is σ = 129566195136. Its totient is φ = 113113343200.

The previous prime is 121211231203. The next prime is 121211231233. The reversal of 121211231213 is 312132112121.

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 121211231213 - 2²⁰ = 121210182637 is a prime.

It is a super-3 number, since 3×121211231213³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211231203) 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 7 ways as a sum of consecutive naturals, for example, 64268003 + ... + 64269888.

It is an arithmetic number, because the mean of its divisors is an integer number (16195774392).

Almost surely, 2^121211231213 is an apocalyptic number.

It is an amenable number.

121211231213 is a deficient number, since it is larger than the sum of its proper divisors (8354963923).

121211231213 is a wasteful number, since it uses less digits than its factorization.

121211231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128537955.

The product of its digits is 144, while the sum is 20.

Adding to 121211231213 its reverse (312132112121), we get a palindrome (433343343334).

The spelling of 121211231213 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred thirty-one thousand, two hundred thirteen".