2021669 has 8 divisors (see below), whose sum is σ = 2230872. Its totient is φ = 1820160.

The previous prime is 2021659. The next prime is 2021671. The reversal of 2021669 is 9661202.

It can be written as a sum of positive squares in 4 ways, for example, as 131044 + 1890625 = 362^2 + 1375^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2021669 - 2⁴ = 2021653 is a prime.

It is a super-2 number, since 2×2021669² = 8174291091122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1364 + ... + 2429.

It is an arithmetic number, because the mean of its divisors is an integer number (278859).

2^2021669 is an apocalyptic number.

It is an amenable number.

2021669 is a deficient number, since it is larger than the sum of its proper divisors (209203).

2021669 is a wasteful number, since it uses less digits than its factorization.

2021669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 2021669 is about 1421.8540712745. The cubic root of 2021669 is about 126.4454919906.

The spelling of 2021669 in words is "two million, twenty-one thousand, six hundred sixty-nine".