99101221 has 2 divisors, whose sum is σ = 99101222. Its totient is φ = 99101220.

The previous prime is 99101183. The next prime is 99101237. The reversal of 99101221 is 12210199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90041121 + 9060100 = 9489^2 + 3010^2 .

It is a cyclic number.

It is not a de Polignac number, because 99101221 - 2¹⁷ = 98970149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99101621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49550610 + 49550611.

It is an arithmetic number, because the mean of its divisors is an integer number (49550611).

Almost surely, 2^99101221 is an apocalyptic number.

It is an amenable number.

99101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

99101221 is an equidigital number, since it uses as much as digits as its factorization.

99101221 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 99101221 is about 9954.9596182004. The cubic root of 99101221 is about 462.7641088072.

The spelling of 99101221 in words is "ninety-nine million, one hundred one thousand, two hundred twenty-one".