121212121011 has 16 divisors (see below), whose sum is σ = 167049784320. Its totient is φ = 78136175520.

The previous prime is 121212121007. The next prime is 121212121153. The reversal of 121212121011 is 110121212121.

It is a happy number.

It is not a de Polignac number, because 121212121011 - 2² = 121212121007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121212121411) 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, 5602435 + ... + 5624028.

It is an arithmetic number, because the mean of its divisors is an integer number (10440611520).

Almost surely, 2^121212121011 is an apocalyptic number.

121212121011 is a deficient number, since it is larger than the sum of its proper divisors (45837663309).

121212121011 is a wasteful number, since it uses less digits than its factorization.

121212121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11226586.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121212121011 its reverse (110121212121), we get a palindrome (231333333132).

The spelling of 121212121011 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, eleven".