1100655221 has 2 divisors, whose sum is σ = 1100655222. Its totient is φ = 1100655220.

The previous prime is 1100655211. The next prime is 1100655223. The reversal of 1100655221 is 1225560011.

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., 1077480625 + 23174596 = 32825^2 + 4814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100655221 is a prime.

It is a super-2 number, since 2×1100655221² = 2422883831029117682, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1100655223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100655223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550327610 + 550327611.

It is an arithmetic number, because the mean of its divisors is an integer number (550327611).

Almost surely, 2^1100655221 is an apocalyptic number.

It is an amenable number.

1100655221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100655221 is an equidigital number, since it uses as much as digits as its factorization.

1100655221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1100655221 is about 33176.1242612816. The cubic root of 1100655221 is about 1032.4850358682.

The spelling of 1100655221 in words is "one billion, one hundred million, six hundred fifty-five thousand, two hundred twenty-one".