99377221 has 2 divisors, whose sum is σ = 99377222. Its totient is φ = 99377220.

The previous prime is 99377219. The next prime is 99377231. The reversal of 99377221 is 12277399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68973025 + 30404196 = 8305^2 + 5514^2 .

It is an emirp because it is prime and its reverse (12277399) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99377221 - 2¹ = 99377219 is a prime.

Together with 99377219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99377231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49688610 + 49688611.

It is an arithmetic number, because the mean of its divisors is an integer number (49688611).

Almost surely, 2^99377221 is an apocalyptic number.

It is an amenable number.

99377221 is a deficient number, since it is larger than the sum of its proper divisors (1).

99377221 is an equidigital number, since it uses as much as digits as its factorization.

99377221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 40.

The square root of 99377221 is about 9968.8124167325. The cubic root of 99377221 is about 463.1933147750.

The spelling of 99377221 in words is "ninety-nine million, three hundred seventy-seven thousand, two hundred twenty-one".