99953221 has 2 divisors, whose sum is σ = 99953222. Its totient is φ = 99953220.

The previous prime is 99953179. The next prime is 99953261. The reversal of 99953221 is 12235999.

It is an a-pointer prime, because the next prime (99953261) can be obtained adding 99953221 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97792321 + 2160900 = 9889^2 + 1470^2 .

It is a cyclic number.

It is not a de Polignac number, because 99953221 - 2²¹ = 97856069 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99953261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49976610 + 49976611.

It is an arithmetic number, because the mean of its divisors is an integer number (49976611).

Almost surely, 2^99953221 is an apocalyptic number.

It is an amenable number.

99953221 is a deficient number, since it is larger than the sum of its proper divisors (1).

99953221 is an equidigital number, since it uses as much as digits as its factorization.

99953221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 40.

The square root of 99953221 is about 9997.6607764016. The cubic root of 99953221 is about 464.0864957780.

The spelling of 99953221 in words is "ninety-nine million, nine hundred fifty-three thousand, two hundred twenty-one".