9101009221 has 2 divisors, whose sum is σ = 9101009222. Its totient is φ = 9101009220.

The previous prime is 9101009147. The next prime is 9101009273. The reversal of 9101009221 is 1229001019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5218473121 + 3882536100 = 72239^2 + 62310^2 .

It is an emirp because it is prime and its reverse (1229001019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9101009221 - 2¹³ = 9101001029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9101006221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4550504610 + 4550504611.

It is an arithmetic number, because the mean of its divisors is an integer number (4550504611).

Almost surely, 2^9101009221 is an apocalyptic number.

It is an amenable number.

9101009221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9101009221 is an equidigital number, since it uses as much as digits as its factorization.

9101009221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 9101009221 is about 95399.2097503957. The cubic root of 9101009221 is about 2087.8366556899.

The spelling of 9101009221 in words is "nine billion, one hundred one million, nine thousand, two hundred twenty-one".