98621221 has 2 divisors, whose sum is σ = 98621222. Its totient is φ = 98621220.

The previous prime is 98621219. The next prime is 98621227. The reversal of 98621221 is 12212689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65788321 + 32832900 = 8111^2 + 5730^2 .

It is a cyclic number.

It is not a de Polignac number, because 98621221 - 2¹ = 98621219 is a prime.

It is a super-2 number, since 2×98621221² = 19452290463061682, which contains 22 as substring.

Together with 98621219, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98621227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49310610 + 49310611.

It is an arithmetic number, because the mean of its divisors is an integer number (49310611).

Almost surely, 2^98621221 is an apocalyptic number.

It is an amenable number.

98621221 is a deficient number, since it is larger than the sum of its proper divisors (1).

98621221 is an equidigital number, since it uses as much as digits as its factorization.

98621221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 98621221 is about 9930.8217686151. The cubic root of 98621221 is about 462.0157615982.

The spelling of 98621221 in words is "ninety-eight million, six hundred twenty-one thousand, two hundred twenty-one".