1099021 has 12 divisors (see below), whose sum is σ = 1395360. Its totient is φ = 855960.

The previous prime is 1098989. The next prime is 1099031. The reversal of 1099021 is 1209901.

It is not a de Polignac number, because 1099021 - 2⁵ = 1098989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1098983 and 1099001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 481 + ... + 1558.

It is an arithmetic number, because the mean of its divisors is an integer number (116280).

2^1099021 is an apocalyptic number.

1099021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1099021 is a deficient number, since it is larger than the sum of its proper divisors (296339).

1099021 is a wasteful number, since it uses less digits than its factorization.

1099021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064 (or 2057 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 1099021 is about 1048.3420243413. The cubic root of 1099021 is about 103.1973781458.

It can be divided in two parts, 10990 and 21, that added together give a palindrome (11011).

The spelling of 1099021 in words is "one million, ninety-nine thousand, twenty-one".