2121221111011 has 8 divisors (see below), whose sum is σ = 2232923349200. Its totient is φ = 2009524775040.

The previous prime is 2121221110993. The next prime is 2121221111083. The reversal of 2121221111011 is 1101111221212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121221111011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121221111411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728130 + ... + 2184631.

It is an arithmetic number, because the mean of its divisors is an integer number (279115418650).

Almost surely, 2^{2121221111011} is an apocalyptic number.

2121221111011 is a deficient number, since it is larger than the sum of its proper divisors (111702238189).

2121221111011 is a wasteful number, since it uses less digits than its factorization.

2121221111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2951109.

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

Adding to 2121221111011 its reverse (1101111221212), we get a palindrome (3222332332223).

The spelling of 2121221111011 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, eleven".