1011100100221 has 2 divisors, whose sum is σ = 1011100100222. Its totient is φ = 1011100100220.

The previous prime is 1011100100209. The next prime is 1011100100243. The reversal of 1011100100221 is 1220010011101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 991048124196 + 20051976025 = 995514^2 + 141605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011100100221 - 2⁵ = 1011100100189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011100100198 and 1011100100207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011100100261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505550050110 + 505550050111.

It is an arithmetic number, because the mean of its divisors is an integer number (505550050111).

Almost surely, 2^{1011100100221} is an apocalyptic number.

It is an amenable number.

1011100100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011100100221 is an equidigital number, since it uses as much as digits as its factorization.

1011100100221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1011100100221 its reverse (1220010011101), we get a palindrome (2231110111322).

The spelling of 1011100100221 in words is "one trillion, eleven billion, one hundred million, one hundred thousand, two hundred twenty-one".