2091021 has 8 divisors (see below), whose sum is σ = 2827584. Its totient is φ = 1374240.

The previous prime is 2090989. The next prime is 2091053. The reversal of 2091021 is 1201902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2090989) and next prime (2091053).

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

It is not a de Polignac number, because 2091021 - 2⁵ = 2090989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4696 + ... + 5121.

It is an arithmetic number, because the mean of its divisors is an integer number (353448).

2^2091021 is an apocalyptic number.

It is an amenable number.

2091021 is a deficient number, since it is larger than the sum of its proper divisors (736563).

2091021 is an equidigital number, since it uses as much as digits as its factorization.

2091021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9891.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 2091021 is about 1446.0363065981. The cubic root of 2091021 is about 127.8751427336.

Adding to 2091021 its reverse (1201902), we get a palindrome (3292923).

The spelling of 2091021 in words is "two million, ninety-one thousand, twenty-one".