2021397 has 12 divisors (see below), whose sum is σ = 3135456. Its totient is φ = 1155000.

The previous prime is 2021381. The next prime is 2021431. The reversal of 2021397 is 7931202.

It is not a de Polignac number, because 2021397 - 2⁴ = 2021381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021377) 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 11 ways as a sum of consecutive naturals, for example, 6729 + ... + 7022.

It is an arithmetic number, because the mean of its divisors is an integer number (261288).

2^2021397 is an apocalyptic number.

It is an amenable number.

2021397 is a deficient number, since it is larger than the sum of its proper divisors (1114059).

2021397 is a wasteful number, since it uses less digits than its factorization.

2021397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13768 (or 13761 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 2021397 is about 1421.7584182976. The cubic root of 2021397 is about 126.4398209805.

Adding to 2021397 its reverse (7931202), we get a palindrome (9952599).

The spelling of 2021397 in words is "two million, twenty-one thousand, three hundred ninety-seven".