1100120621 has 2 divisors, whose sum is σ = 1100120622. Its totient is φ = 1100120620.

The previous prime is 1100120611. The next prime is 1100120639. The reversal of 1100120621 is 1260210011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 912704521 + 187416100 = 30211^2 + 13690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100120621 - 2¹⁸ = 1099858477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1100120596 and 1100120605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100120611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550060310 + 550060311.

It is an arithmetic number, because the mean of its divisors is an integer number (550060311).

Almost surely, 2^1100120621 is an apocalyptic number.

It is an amenable number.

1100120621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100120621 is an equidigital number, since it uses as much as digits as its factorization.

1100120621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1100120621 is about 33168.0662837013. The cubic root of 1100120621 is about 1032.3178457924.

Adding to 1100120621 its reverse (1260210011), we get a palindrome (2360330632).

The spelling of 1100120621 in words is "one billion, one hundred million, one hundred twenty thousand, six hundred twenty-one".