2021956 has 12 divisors (see below), whose sum is σ = 3625020. Its totient is φ = 986240.

The previous prime is 2021933. The next prime is 2021959. The reversal of 2021956 is 6591202.

It can be written as a sum of positive squares in 2 ways, for example, as 33856 + 1988100 = 184^2 + 1410^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2021956.

It is not an unprimeable number, because it can be changed into a prime (2021959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6001 + ... + 6328.

It is an arithmetic number, because the mean of its divisors is an integer number (302085).

2^2021956 is an apocalyptic number.

It is an amenable number.

2021956 is a deficient number, since it is larger than the sum of its proper divisors (1603064).

2021956 is a wasteful number, since it uses less digits than its factorization.

2021956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12374 (or 12372 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 2021956 is about 1421.9549922554. The cubic root of 2021956 is about 126.4514751888.

The spelling of 2021956 in words is "two million, twenty-one thousand, nine hundred fifty-six".