2021966 has 4 divisors (see below), whose sum is σ = 3032952. Its totient is φ = 1010982.

The previous prime is 2021959. The next prime is 2022011. The reversal of 2021966 is 6691202.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505490 + ... + 505493.

It is an arithmetic number, because the mean of its divisors is an integer number (758238).

2^2021966 is an apocalyptic number.

2021966 is a deficient number, since it is larger than the sum of its proper divisors (1010986).

2021966 is a wasteful number, since it uses less digits than its factorization.

2021966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010985.

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

The square root of 2021966 is about 1421.9585085367. The cubic root of 2021966 is about 126.4516836524.

It can be divided in two parts, 202196 and 6, that added together give a palindrome (202202).

The spelling of 2021966 in words is "two million, twenty-one thousand, nine hundred sixty-six".