1100021123821 has 2 divisors, whose sum is σ = 1100021123822. Its totient is φ = 1100021123820.

The previous prime is 1100021123777. The next prime is 1100021123867. The reversal of 1100021123821 is 1283211200011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1070419921321 + 29601202500 = 1034611^2 + 172050^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100021123821 - 2¹⁹ = 1100020599533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1100021123792 and 1100021123801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100021153821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550010561910 + 550010561911.

It is an arithmetic number, because the mean of its divisors is an integer number (550010561911).

Almost surely, 2^{1100021123821} is an apocalyptic number.

It is an amenable number.

1100021123821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100021123821 is an equidigital number, since it uses as much as digits as its factorization.

1100021123821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 1100021123821 its reverse (1283211200011), we get a palindrome (2383232323832).

The spelling of 1100021123821 in words is "one trillion, one hundred billion, twenty-one million, one hundred twenty-three thousand, eight hundred twenty-one".