121312013213 has 4 divisors (see below), whose sum is σ = 121315154688. Its totient is φ = 121308871740.

The previous prime is 121312013197. The next prime is 121312013239. The reversal of 121312013213 is 312310213121.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 121312013213 - 2⁴ = 121312013197 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 (121312010213) 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, 1512083 + ... + 1590288.

It is an arithmetic number, because the mean of its divisors is an integer number (30328788672).

Almost surely, 2^121312013213 is an apocalyptic number.

It is an amenable number.

121312013213 is a deficient number, since it is larger than the sum of its proper divisors (3141475).

121312013213 is an equidigital number, since it uses as much as digits as its factorization.

121312013213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141474.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 121312013213 its reverse (312310213121), we get a palindrome (433622226334).

The spelling of 121312013213 in words is "one hundred twenty-one billion, three hundred twelve million, thirteen thousand, two hundred thirteen".