1671021 has 12 divisors (see below), whose sum is σ = 2633280. Its totient is φ = 1012680.

The previous prime is 1670983. The next prime is 1671041. The reversal of 1671021 is 1201761.

It is a de Polignac number, because none of the positive numbers 2^k-1671021 is a prime.

It is a super-2 number, since 2×1671021² = 5584622364882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1670985 and 1671003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671041) 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, 8341 + ... + 8538.

It is an arithmetic number, because the mean of its divisors is an integer number (219440).

2^1671021 is an apocalyptic number.

1671021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1671021 is a deficient number, since it is larger than the sum of its proper divisors (962259).

1671021 is a wasteful number, since it uses less digits than its factorization.

1671021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16896 (or 16893 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 1671021 is about 1292.6797747315. The cubic root of 1671021 is about 118.6662730212. Note that the first 3 decimals are identical.

Adding to 1671021 its reverse (1201761), we get a palindrome (2872782).

The spelling of 1671021 in words is "one million, six hundred seventy-one thousand, twenty-one".