2211122012021 has 4 divisors (see below), whose sum is σ = 2381208320652. Its totient is φ = 2041035703392.

The previous prime is 2211122011991. The next prime is 2211122012207. The reversal of 2211122012021 is 1202102211122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 844827531025 + 1366294480996 = 919145^2 + 1168886^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211122012021 - 2⁶ = 2211122011957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211122012521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85043154296 + ... + 85043154321.

It is an arithmetic number, because the mean of its divisors is an integer number (595302080163).

Almost surely, 2^{2211122012021} is an apocalyptic number.

It is an amenable number.

2211122012021 is a deficient number, since it is larger than the sum of its proper divisors (170086308631).

2211122012021 is a wasteful number, since it uses less digits than its factorization.

2211122012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170086308630.

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

Adding to 2211122012021 its reverse (1202102211122), we get a palindrome (3413224223143).

The spelling of 2211122012021 in words is "two trillion, two hundred eleven billion, one hundred twenty-two million, twelve thousand, twenty-one".