98021021 has 6 divisors (see below), whose sum is σ = 114024510. Its totient is φ = 84017976.

The previous prime is 98021017. The next prime is 98021023. The reversal of 98021021 is 12012089.

It can be written as a sum of positive squares in only one way, i.e., 66504025 + 31516996 = 8155^2 + 5614^2 .

It is not a de Polignac number, because 98021021 - 2² = 98021017 is a prime.

It is a Duffinian number.

98021021 is a modest number, since divided by 21021 gives 98 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98021023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1000166 + ... + 1000263.

It is an arithmetic number, because the mean of its divisors is an integer number (19004085).

Almost surely, 2^98021021 is an apocalyptic number.

It is an amenable number.

98021021 is a deficient number, since it is larger than the sum of its proper divisors (16003489).

98021021 is a wasteful number, since it uses less digits than its factorization.

98021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000443 (or 2000436 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 98021021 is about 9900.5566005149. The cubic root of 98021021 is about 461.0765914686.

The spelling of 98021021 in words is "ninety-eight million, twenty-one thousand, twenty-one".