2012221021121 has 4 divisors (see below), whose sum is σ = 2012244950100. Its totient is φ = 2012197092144.

The previous prime is 2012221021103. The next prime is 2012221021141. The reversal of 2012221021121 is 1211201222102.

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 2003810113600 + 8410907521 = 1415560^2 + 91711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2012221021121 - 2²² = 2012216826817 is a prime.

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 2012221021121.

It is not an unprimeable number, because it can be changed into a prime (2012221021141) 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, 11837906 + ... + 12006683.

It is an arithmetic number, because the mean of its divisors is an integer number (503061237525).

Almost surely, 2^{2012221021121} is an apocalyptic number.

It is an amenable number.

2012221021121 is a deficient number, since it is larger than the sum of its proper divisors (23928979).

2012221021121 is an equidigital number, since it uses as much as digits as its factorization.

2012221021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23928978.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2012221021121 its reverse (1211201222102), we get a palindrome (3223422243223).

The spelling of 2012221021121 in words is "two trillion, twelve billion, two hundred twenty-one million, twenty-one thousand, one hundred twenty-one".