2011220121221 has 16 divisors (see below), whose sum is σ = 2060900496000. Its totient is φ = 1961977363008.

The previous prime is 2011220121203. The next prime is 2011220121223. The reversal of 2011220121221 is 1221210221102.

It is a cyclic number.

It is not a de Polignac number, because 2011220121221 - 2¹⁴ = 2011220104837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2011220121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011220121223) 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 15 ways as a sum of consecutive naturals, for example, 123009755 + ... + 123026103.

It is an arithmetic number, because the mean of its divisors is an integer number (128806281000).

Almost surely, 2^{2011220121221} is an apocalyptic number.

It is an amenable number.

2011220121221 is a deficient number, since it is larger than the sum of its proper divisors (49680374779).

2011220121221 is a wasteful number, since it uses less digits than its factorization.

2011220121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29548.

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

Adding to 2011220121221 its reverse (1221210221102), we get a palindrome (3232430342323).

The spelling of 2011220121221 in words is "two trillion, eleven billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".