2021705 has 16 divisors (see below), whose sum is σ = 2833920. Its totient is φ = 1355712.

The previous prime is 2021699. The next prime is 2021711. The reversal of 2021705 is 5071202.

It is an interprime number because it is at equal distance from previous prime (2021699) and next prime (2021711).

It is a cyclic number.

It is not a de Polignac number, because 2021705 - 2¹⁶ = 1956169 is a prime.

It is a super-2 number, since 2×2021705² = 8174582214050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1031 + ... + 2259.

It is an arithmetic number, because the mean of its divisors is an integer number (177120).

2^2021705 is an apocalyptic number.

It is an amenable number.

2021705 is a deficient number, since it is larger than the sum of its proper divisors (812215).

2021705 is a wasteful number, since it uses less digits than its factorization.

2021705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 2021705 is about 1421.8667307452. The cubic root of 2021705 is about 126.4462425274.

Adding to 2021705 its reverse (5071202), we get a palindrome (7092907).

The spelling of 2021705 in words is "two million, twenty-one thousand, seven hundred five".