1098385021 has 2 divisors, whose sum is σ = 1098385022. Its totient is φ = 1098385020.

The previous prime is 1098385009. The next prime is 1098385049. The reversal of 1098385021 is 1205838901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 857669796 + 240715225 = 29286^2 + 15515^2 .

It is an emirp because it is prime and its reverse (1205838901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1098385021 - 2¹¹ = 1098382973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1098385051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549192510 + 549192511.

It is an arithmetic number, because the mean of its divisors is an integer number (549192511).

Almost surely, 2^1098385021 is an apocalyptic number.

It is an amenable number.

1098385021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098385021 is an equidigital number, since it uses as much as digits as its factorization.

1098385021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1098385021 is about 33141.8922362619. The cubic root of 1098385021 is about 1031.7746829600.

The spelling of 1098385021 in words is "one billion, ninety-eight million, three hundred eighty-five thousand, twenty-one".