1011001022221 has 2 divisors, whose sum is σ = 1011001022222. Its totient is φ = 1011001022220.

The previous prime is 1011001022159. The next prime is 1011001022257. The reversal of 1011001022221 is 1222201001101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 933223621225 + 77777400996 = 966035^2 + 278886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011001022221 - 2⁷ = 1011001022093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011601022221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505500511110 + 505500511111.

It is an arithmetic number, because the mean of its divisors is an integer number (505500511111).

Almost surely, 2^{1011001022221} is an apocalyptic number.

It is an amenable number.

1011001022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011001022221 is an equidigital number, since it uses as much as digits as its factorization.

1011001022221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1011001022221 its reverse (1222201001101), we get a palindrome (2233202023322).

The spelling of 1011001022221 in words is "one trillion, eleven billion, one million, twenty-two thousand, two hundred twenty-one".