2021090 has 8 divisors (see below), whose sum is σ = 3637980. Its totient is φ = 808432.

The previous prime is 2021083. The next prime is 2021099. The reversal of 2021090 is 901202.

It can be written as a sum of positive squares in 2 ways, for example, as 2019241 + 1849 = 1421^2 + 43^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2021099) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 101045 + ... + 101064.

2^2021090 is an apocalyptic number.

2021090 is a deficient number, since it is larger than the sum of its proper divisors (1616890).

2021090 is a wasteful number, since it uses less digits than its factorization.

2021090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202116.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 2021090 is about 1421.6504493018. The cubic root of 2021090 is about 126.4334196335.

Adding to 2021090 its reverse (901202), we get a palindrome (2922292).

The spelling of 2021090 in words is "two million, twenty-one thousand, ninety".