12121010101211 has 16 divisors (see below), whose sum is σ = 13686124888800. Its totient is φ = 10633498444800.

The previous prime is 12121010101201. The next prime is 12121010101217. The reversal of 12121010101211 is 11210101012121.

It is not a de Polignac number, because 12121010101211 - 2¹⁸ = 12121009839067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121010101217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9454820 + ... + 10660001.

It is an arithmetic number, because the mean of its divisors is an integer number (855382805550).

Almost surely, 2^{12121010101211} is an apocalyptic number.

12121010101211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12121010101211 is a deficient number, since it is larger than the sum of its proper divisors (1565114787589).

12121010101211 is a wasteful number, since it uses less digits than its factorization.

12121010101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20116750.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 12121010101211 its reverse (11210101012121), we get a palindrome (23331111113332).

It can be divided in two parts, 12121010 and 101211, that added together give a palindrome (12222221).

The spelling of 12121010101211 in words is "twelve trillion, one hundred twenty-one billion, ten million, one hundred one thousand, two hundred eleven".