20121210221111 has 8 divisors (see below), whose sum is σ = 21252508735920. Its totient is φ = 18997140451392.

The previous prime is 20121210221107. The next prime is 20121210221137. The reversal of 20121210221111 is 11112201212102.

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 20121210221111 - 2² = 20121210221107 is a prime.

It is a super-4 number, since 4×20121210221111⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121210221111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121210221141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1807180550 + ... + 1807191683.

It is an arithmetic number, because the mean of its divisors is an integer number (2656563591990).

Almost surely, 2^{20121210221111} is an apocalyptic number.

20121210221111 is a deficient number, since it is larger than the sum of its proper divisors (1131298514809).

20121210221111 is a wasteful number, since it uses less digits than its factorization.

20121210221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614372545.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20121210221111 its reverse (11112201212102), we get a palindrome (31233411433213).

Subtracting from 20121210221111 its reverse (11112201212102), we obtain a palindrome (9009009009009).

The spelling of 20121210221111 in words is "twenty trillion, one hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one hundred eleven".