1098021 has 16 divisors (see below), whose sum is σ = 1532160. Its totient is φ = 698880.

The previous prime is 1098017. The next prime is 1098023. The reversal of 1098021 is 1208901.

It is not a de Polignac number, because 1098021 - 2² = 1098017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9661 + ... + 9773.

It is an arithmetic number, because the mean of its divisors is an integer number (95760).

2^1098021 is an apocalyptic number.

It is an amenable number.

1098021 is a deficient number, since it is larger than the sum of its proper divisors (434139).

1098021 is a wasteful number, since it uses less digits than its factorization.

1098021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1098021 is about 1047.8649722173. The cubic root of 1098021 is about 103.1660688582.

The spelling of 1098021 in words is "one million, ninety-eight thousand, twenty-one".