1101021221221 has 2 divisors, whose sum is σ = 1101021221222. Its totient is φ = 1101021221220.

The previous prime is 1101021221219. The next prime is 1101021221233. The reversal of 1101021221221 is 1221221201011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1070219216196 + 30802005025 = 1034514^2 + 175505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101021221221 - 2¹ = 1101021221219 is a prime.

Together with 1101021221219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1101021221195 and 1101021221204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101021222221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550510610610 + 550510610611.

It is an arithmetic number, because the mean of its divisors is an integer number (550510610611).

Almost surely, 2^{1101021221221} is an apocalyptic number.

It is an amenable number.

1101021221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101021221221 is an equidigital number, since it uses as much as digits as its factorization.

1101021221221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1101021221221 its reverse (1221221201011), we get a palindrome (2322242422232).

The spelling of 1101021221221 in words is "one trillion, one hundred one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".