2121221011011 has 4 divisors (see below), whose sum is σ = 2828294681352. Its totient is φ = 1414147340672.

The previous prime is 2121221011009. The next prime is 2121221011057. The reversal of 2121221011011 is 1101101221212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2121221011011 - 2¹ = 2121221011009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121221011001) 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, 353536835166 + ... + 353536835171.

It is an arithmetic number, because the mean of its divisors is an integer number (707073670338).

Almost surely, 2^{2121221011011} is an apocalyptic number.

2121221011011 is a deficient number, since it is larger than the sum of its proper divisors (707073670341).

2121221011011 is an equidigital number, since it uses as much as digits as its factorization.

2121221011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707073670340.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2121221011011 its reverse (1101101221212), we get a palindrome (3222322232223).

The spelling of 2121221011011 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, eleven thousand, eleven".