2011221111021 has 4 divisors (see below), whose sum is σ = 2681628148032. Its totient is φ = 1340814074012.

The previous prime is 2011221111001. The next prime is 2011221111121. The reversal of 2011221111021 is 1201111221102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2011221111021 - 2⁷ = 2011221110893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011221111001) 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, 335203518501 + ... + 335203518506.

It is an arithmetic number, because the mean of its divisors is an integer number (670407037008).

Almost surely, 2^{2011221111021} is an apocalyptic number.

It is an amenable number.

2011221111021 is a deficient number, since it is larger than the sum of its proper divisors (670407037011).

2011221111021 is an equidigital number, since it uses as much as digits as its factorization.

2011221111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670407037010.

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

Adding to 2011221111021 its reverse (1201111221102), we get a palindrome (3212332332123).

The spelling of 2011221111021 in words is "two trillion, eleven billion, two hundred twenty-one million, one hundred eleven thousand, twenty-one".