12111220002121 has 4 divisors (see below), whose sum is σ = 12149913996052. Its totient is φ = 12072526008192.

The previous prime is 12111220002113. The next prime is 12111220002127. The reversal of 12111220002121 is 12120002211121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3486361152400 + 8624858849721 = 1867180^2 + 2936811^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111220002121 - 2³ = 12111220002113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111220002095 and 12111220002104.

It is not an unprimeable number, because it can be changed into a prime (12111220002127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19346996496 + ... + 19346997121.

It is an arithmetic number, because the mean of its divisors is an integer number (3037478499013).

Almost surely, 2^{12111220002121} is an apocalyptic number.

It is an amenable number.

12111220002121 is a deficient number, since it is larger than the sum of its proper divisors (38693993931).

12111220002121 is an equidigital number, since it uses as much as digits as its factorization.

12111220002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38693993930.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12111220002121 its reverse (12120002211121), we get a palindrome (24231222213242).

The spelling of 12111220002121 in words is "twelve trillion, one hundred eleven billion, two hundred twenty million, two thousand, one hundred twenty-one".