1011120011221 has 2 divisors, whose sum is σ = 1011120011222. Its totient is φ = 1011120011220.

The previous prime is 1011120011219. The next prime is 1011120011269. The reversal of 1011120011221 is 1221100211101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000722130321 + 10397880900 = 1000361^2 + 101970^2 .

It is an emirp because it is prime and its reverse (1221100211101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1011120011221 - 2¹ = 1011120011219 is a prime.

Together with 1011120011219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011120018221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505560005610 + 505560005611.

It is an arithmetic number, because the mean of its divisors is an integer number (505560005611).

Almost surely, 2^{1011120011221} is an apocalyptic number.

It is an amenable number.

1011120011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011120011221 is an equidigital number, since it uses as much as digits as its factorization.

1011120011221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1011120011221 its reverse (1221100211101), we get a palindrome (2232220222322).

The spelling of 1011120011221 in words is "one trillion, eleven billion, one hundred twenty million, eleven thousand, two hundred twenty-one".