2021969 has 4 divisors (see below), whose sum is σ = 2028144. Its totient is φ = 2015796.

The previous prime is 2021959. The next prime is 2022011. The reversal of 2021969 is 9691202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9691202 = 2 ⋅4845601.

It is a cyclic number.

It is not a de Polignac number, because 2021969 - 2¹⁶ = 1956433 is a prime.

It is a super-2 number, since 2×2021969² = 8176717273922, which contains 22 as substring.

It is a Duffinian number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2567 + ... + 3260.

It is an arithmetic number, because the mean of its divisors is an integer number (507036).

2^2021969 is an apocalyptic number.

It is an amenable number.

2021969 is a deficient number, since it is larger than the sum of its proper divisors (6175).

2021969 is an equidigital number, since it uses as much as digits as its factorization.

2021969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6174.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 2021969 is about 1421.9595634194. The cubic root of 2021969 is about 126.4517461914.

The spelling of 2021969 in words is "two million, twenty-one thousand, nine hundred sixty-nine".