1011221021101 has 2 divisors, whose sum is σ = 1011221021102. Its totient is φ = 1011221021100.

The previous prime is 1011221021093. The next prime is 1011221021117. The reversal of 1011221021101 is 1011201221101.

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., 713433622500 + 297787398601 = 844650^2 + 545699^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011221021101 - 2³ = 1011221021093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011221021141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505610510550 + 505610510551.

It is an arithmetic number, because the mean of its divisors is an integer number (505610510551).

Almost surely, 2^{1011221021101} is an apocalyptic number.

It is an amenable number.

1011221021101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011221021101 is an equidigital number, since it uses as much as digits as its factorization.

1011221021101 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 1011221021101 its reverse (1011201221101), we get a palindrome (2022422242202).

The spelling of 1011221021101 in words is "one trillion, eleven billion, two hundred twenty-one million, twenty-one thousand, one hundred one".