12121211011 has 8 divisors (see below), whose sum is σ = 14918413664. Its totient is φ = 9590408640.

The previous prime is 12121210993. The next prime is 12121211033. The reversal of 12121211011 is 11011212121.

It is a happy number.

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 12121211011 - 2²¹ = 12119113859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 12121210982 and 12121211000.

It is not an unprimeable number, because it can be changed into a prime (12121211111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66599970 + ... + 66600151.

It is an arithmetic number, because the mean of its divisors is an integer number (1864801708).

Almost surely, 2^12121211011 is an apocalyptic number.

12121211011 is a deficient number, since it is larger than the sum of its proper divisors (2797202653).

12121211011 is a wasteful number, since it uses less digits than its factorization.

12121211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133200141.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12121211011 its reverse (11011212121), we get a palindrome (23132423132).

It can be divided in two parts, 121212110 and 11, that added together give a palindrome (121212121).

The spelling of 12121211011 in words is "twelve billion, one hundred twenty-one million, two hundred eleven thousand, eleven".