121311213 has 16 divisors (see below), whose sum is σ = 165935616. Its totient is φ = 78790320.

The previous prime is 121311209. The next prime is 121311227. The reversal of 121311213 is 312113121.

It is a happy number.

It is not a de Polignac number, because 121311213 - 2² = 121311209 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121311192 and 121311201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121311293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61858 + ... + 63788.

It is an arithmetic number, because the mean of its divisors is an integer number (10370976).

Almost surely, 2^121311213 is an apocalyptic number.

It is an amenable number.

121311213 is a deficient number, since it is larger than the sum of its proper divisors (44624403).

121311213 is a wasteful number, since it uses less digits than its factorization.

121311213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464.

The product of its digits is 36, while the sum is 15.

The square root of 121311213 is about 11014.1369611967. The cubic root of 121311213 is about 495.0324272196.

Adding to 121311213 its reverse (312113121), we get a palindrome (433424334).

The spelling of 121311213 in words is "one hundred twenty-one million, three hundred eleven thousand, two hundred thirteen".