2121121221011 has 16 divisors (see below), whose sum is σ = 2313686578560. Its totient is φ = 1932766617600.

The previous prime is 2121121220987. The next prime is 2121121221047. The reversal of 2121121221011 is 1101221211212.

It is not a de Polignac number, because 2121121221011 - 2¹⁸ = 2121120958867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121121229011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4715531 + ... + 5145723.

It is an arithmetic number, because the mean of its divisors is an integer number (144605411160).

Almost surely, 2^{2121121221011} is an apocalyptic number.

2121121221011 is a deficient number, since it is larger than the sum of its proper divisors (192565357549).

2121121221011 is a wasteful number, since it uses less digits than its factorization.

2121121221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435086.

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

Adding to 2121121221011 its reverse (1101221211212), we get a palindrome (3222342432223).

The spelling of 2121121221011 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, eleven".