98611211221 has 4 divisors (see below), whose sum is σ = 98613951372. Its totient is φ = 98608471072.

The previous prime is 98611211207. The next prime is 98611211233. The reversal of 98611211221 is 12211211689.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13633131121 + 84978080100 = 116761^2 + 291510^2 .

It is a cyclic number.

It is not a de Polignac number, because 98611211221 - 2⁵ = 98611211189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98611281221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1315366 + ... + 1388311.

It is an arithmetic number, because the mean of its divisors is an integer number (24653487843).

Almost surely, 2^98611211221 is an apocalyptic number.

It is an amenable number.

98611211221 is a deficient number, since it is larger than the sum of its proper divisors (2740151).

98611211221 is a wasteful number, since it uses less digits than its factorization.

98611211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740150.

The product of its digits is 3456, while the sum is 34.

The spelling of 98611211221 in words is "ninety-eight billion, six hundred eleven million, two hundred eleven thousand, two hundred twenty-one".