1100210021 has 2 divisors, whose sum is σ = 1100210022. Its totient is φ = 1100210020.

The previous prime is 1100209973. The next prime is 1100210039. The reversal of 1100210021 is 1200120011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1087350625 + 12859396 = 32975^2 + 3586^2 .

It is an emirp because it is prime and its reverse (1200120011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1100210021 - 2¹⁴ = 1100193637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1100209990 and 1100210008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100210071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550105010 + 550105011.

It is an arithmetic number, because the mean of its divisors is an integer number (550105011).

Almost surely, 2^1100210021 is an apocalyptic number.

It is an amenable number.

1100210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100210021 is an equidigital number, since it uses as much as digits as its factorization.

1100210021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1100210021 is about 33169.4139381449. The cubic root of 1100210021 is about 1032.3458083975.

Adding to 1100210021 its reverse (1200120011), we get a palindrome (2300330032).

The spelling of 1100210021 in words is "one billion, one hundred million, two hundred ten thousand, twenty-one".