2011012011221 has 2 divisors, whose sum is σ = 2011012011222. Its totient is φ = 2011012011220.

The previous prime is 2011012011191. The next prime is 2011012011263. The reversal of 2011012011221 is 1221102101102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1482272160196 + 528739851025 = 1217486^2 + 727145^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011012011221 - 2¹⁰ = 2011012010197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2011012011196 and 2011012011205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011012011121) 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 as a sum of consecutive naturals, namely, 1005506005610 + 1005506005611.

It is an arithmetic number, because the mean of its divisors is an integer number (1005506005611).

Almost surely, 2^{2011012011221} is an apocalyptic number.

It is an amenable number.

2011012011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011012011221 is an equidigital number, since it uses as much as digits as its factorization.

2011012011221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2011012011221 its reverse (1221102101102), we get a palindrome (3232114112323).

The spelling of 2011012011221 in words is "two trillion, eleven billion, twelve million, eleven thousand, two hundred twenty-one".