98991211021 has 8 divisors (see below), whose sum is σ = 107370668664. Its totient is φ = 90895802880.

The previous prime is 98991210979. The next prime is 98991211027. The reversal of 98991211021 is 12011219989.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18115814025 + 80875396996 = 134595^2 + 284386^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 98991211021 - 2³¹ = 96843727373 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 (98991211027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71011650 + ... + 71013043.

It is an arithmetic number, because the mean of its divisors is an integer number (13421333583).

Almost surely, 2^98991211021 is an apocalyptic number.

It is an amenable number.

98991211021 is a deficient number, since it is larger than the sum of its proper divisors (8379457643).

98991211021 is a wasteful number, since it uses less digits than its factorization.

98991211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142024751.

The product of its (nonzero) digits is 23328, while the sum is 43.

The spelling of 98991211021 in words is "ninety-eight billion, nine hundred ninety-one million, two hundred eleven thousand, twenty-one".