2021943 has 16 divisors (see below), whose sum is σ = 3361536. Its totient is φ = 1050240.

The previous prime is 2021933. The next prime is 2021959. The reversal of 2021943 is 3491202.

It is not a de Polignac number, because 2021943 - 2⁴ = 2021927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

2021943 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4146 + ... + 4607.

It is an arithmetic number, because the mean of its divisors is an integer number (210096).

2^2021943 is an apocalyptic number.

2021943 is a deficient number, since it is larger than the sum of its proper divisors (1339593).

2021943 is a wasteful number, since it uses less digits than its factorization.

2021943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8774.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 2021943 is about 1421.9504210766. The cubic root of 2021943 is about 126.4512041851.

It can be divided in two parts, 202 and 1943, that added together give a triangular number (2145 = T₆₅).

The spelling of 2021943 in words is "two million, twenty-one thousand, nine hundred forty-three".