121211233311 has 24 divisors (see below), whose sum is σ = 190380875520. Its totient is φ = 68386801392.

The previous prime is 121211233309. The next prime is 121211233331. The reversal of 121211233311 is 113332112121.

It is not a de Polignac number, because 121211233311 - 2¹ = 121211233309 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211233301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5207161 + ... + 5230386.

It is an arithmetic number, because the mean of its divisors is an integer number (7932536480).

Almost surely, 2^121211233311 is an apocalyptic number.

121211233311 is a deficient number, since it is larger than the sum of its proper divisors (69169642209).

121211233311 is a wasteful number, since it uses less digits than its factorization.

121211233311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10437643 (or 10437636 counting only the distinct ones).

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

Adding to 121211233311 its reverse (113332112121), we get a palindrome (234543345432).

The spelling of 121211233311 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred thirty-three thousand, three hundred eleven".