121213123311 has 16 divisors (see below), whose sum is σ = 194427065600. Its totient is φ = 65619134208.

The previous prime is 121213123267. The next prime is 121213123313. The reversal of 121213123311 is 113321312121.

It is not a de Polignac number, because 121213123311 - 2¹⁰ = 121213122287 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213123313) 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, 151895746 + ... + 151896543.

It is an arithmetic number, because the mean of its divisors is an integer number (12151691600).

Almost surely, 2^121213123311 is an apocalyptic number.

121213123311 is a deficient number, since it is larger than the sum of its proper divisors (73213942289).

121213123311 is a wasteful number, since it uses less digits than its factorization.

121213123311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303792318.

The product of its digits is 216, while the sum is 21.

Adding to 121213123311 its reverse (113321312121), we get a palindrome (234534435432).

The spelling of 121213123311 in words is "one hundred twenty-one billion, two hundred thirteen million, one hundred twenty-three thousand, three hundred eleven".