2011122221021 has 4 divisors (see below), whose sum is σ = 2011203697344. Its totient is φ = 2011040744700.

The previous prime is 2011122220963. The next prime is 2011122221029. The reversal of 2011122221021 is 1201222211102.

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 a de Polignac number, because none of the positive numbers 2^k-2011122221021 is a prime.

It is a super-2 number, since 2×2011122221021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011122221029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40701125 + ... + 40750506.

It is an arithmetic number, because the mean of its divisors is an integer number (502800924336).

Almost surely, 2^{2011122221021} is an apocalyptic number.

It is an amenable number.

2011122221021 is a deficient number, since it is larger than the sum of its proper divisors (81476323).

2011122221021 is an equidigital number, since it uses as much as digits as its factorization.

2011122221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81476322.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2011122221021 its reverse (1201222211102), we get a palindrome (3212344432123).

The spelling of 2011122221021 in words is "two trillion, eleven billion, one hundred twenty-two million, two hundred twenty-one thousand, twenty-one".