12121222311 has 144 divisors (see below), whose sum is σ = 21192837120. Its totient is φ = 6646147200.

The previous prime is 12121222303. The next prime is 12121222319. The reversal of 12121222311 is 11322212121.

12121222311 is a `hidden beast` number, since 12 + 121 + 222 + 311 = 666.

It is an interprime number because it is at equal distance from previous prime (12121222303) and next prime (12121222319).

It is not a de Polignac number, because 12121222311 - 2³ = 12121222303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121222319) 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 143 ways as a sum of consecutive naturals, for example, 54355146 + ... + 54355368.

It is an arithmetic number, because the mean of its divisors is an integer number (147172480).

Almost surely, 2^12121222311 is an apocalyptic number.

12121222311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12121222311 is a deficient number, since it is larger than the sum of its proper divisors (9071614809).

12121222311 is a wasteful number, since it uses less digits than its factorization.

12121222311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 364 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 12121222311 its reverse (11322212121), we get a palindrome (23443434432).

It can be divided in two parts, 12121 and 222311, that added together give a palindrome (234432).

The spelling of 12121222311 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, three hundred eleven".