1100012210821 has 2 divisors, whose sum is σ = 1100012210822. Its totient is φ = 1100012210820.

The previous prime is 1100012210819. The next prime is 1100012210837. The reversal of 1100012210821 is 1280122100011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1100010806596 + 1404225 = 1048814^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100012210821 - 2¹ = 1100012210819 is a prime.

Together with 1100012210819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100012210881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550006105410 + 550006105411.

It is an arithmetic number, because the mean of its divisors is an integer number (550006105411).

Almost surely, 2^{1100012210821} is an apocalyptic number.

It is an amenable number.

1100012210821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100012210821 is an equidigital number, since it uses as much as digits as its factorization.

1100012210821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 1100012210821 its reverse (1280122100011), we get a palindrome (2380134310832).

The spelling of 1100012210821 in words is "one trillion, one hundred billion, twelve million, two hundred ten thousand, eight hundred twenty-one".