2011212121121 has 6 divisors (see below), whose sum is σ = 2339573283810. Its totient is φ = 1723896103776.

The previous prime is 2011212121117. The next prime is 2011212121147. The reversal of 2011212121121 is 1211212121102.

It can be written as a sum of positive squares in only one way, i.e., 1992512926096 + 18699195025 = 1411564^2 + 136745^2 .

It is not a de Polignac number, because 2011212121121 - 2² = 2011212121117 is a prime.

It is a super-2 number, since 2×2011212121121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2011212121121.

It is not an unprimeable number, because it can be changed into a prime (2011212121111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20522572616 + ... + 20522572713.

It is an arithmetic number, because the mean of its divisors is an integer number (389928880635).

Almost surely, 2^{2011212121121} is an apocalyptic number.

It is an amenable number.

2011212121121 is a deficient number, since it is larger than the sum of its proper divisors (328361162689).

2011212121121 is an equidigital number, since it uses as much as digits as its factorization.

2011212121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41045145343 (or 41045145336 counting only the distinct ones).

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

Adding to 2011212121121 its reverse (1211212121102), we get a palindrome (3222424242223).

The spelling of 2011212121121 in words is "two trillion, eleven billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twenty-one".