1101220011821 has 2 divisors, whose sum is σ = 1101220011822. Its totient is φ = 1101220011820.

The previous prime is 1101220011761. The next prime is 1101220011877. The reversal of 1101220011821 is 1281100221011.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 691541928100 + 409678083721 = 831590^2 + 640061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101220011821 - 2¹⁴ = 1101219995437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1101220011793 and 1101220011802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101220013821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550610005910 + 550610005911.

It is an arithmetic number, because the mean of its divisors is an integer number (550610005911).

Almost surely, 2^{1101220011821} is an apocalyptic number.

It is an amenable number.

1101220011821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101220011821 is an equidigital number, since it uses as much as digits as its factorization.

1101220011821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 1101220011821 its reverse (1281100221011), we get a palindrome (2382320232832).

The spelling of 1101220011821 in words is "one trillion, one hundred one billion, two hundred twenty million, eleven thousand, eight hundred twenty-one".