1021671 has 12 divisors (see below), whose sum is σ = 1686672. Its totient is φ = 583776.

The previous prime is 1021663. The next prime is 1021673. The reversal of 1021671 is 1761201.

It is not a de Polignac number, because 1021671 - 2³ = 1021663 is a prime.

1021671 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021673) 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, 8046 + ... + 8171.

It is an arithmetic number, because the mean of its divisors is an integer number (140556).

2^1021671 is an apocalyptic number.

1021671 is a deficient number, since it is larger than the sum of its proper divisors (665001).

1021671 is a wasteful number, since it uses less digits than its factorization.

1021671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16230 (or 16227 counting only the distinct ones).

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

The square root of 1021671 is about 1010.7774235706. Note that the first 3 decimals coincide. The cubic root of 1021671 is about 100.7172104607.

Adding to 1021671 its reverse (1761201), we get a palindrome (2782872).

The spelling of 1021671 in words is "one million, twenty-one thousand, six hundred seventy-one".