2021357 has 8 divisors (see below), whose sum is σ = 2213400. Its totient is φ = 1834560.

The previous prime is 2021339. The next prime is 2021377. The reversal of 2021357 is 7531202.

It can be written as a sum of positive squares in 4 ways, for example, as 44521 + 1976836 = 211^2 + 1406^2 .

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

It is not a de Polignac number, because 2021357 - 2¹⁸ = 1759213 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482 + ... + 2067.

It is an arithmetic number, because the mean of its divisors is an integer number (276675).

2^2021357 is an apocalyptic number.

It is an amenable number.

2021357 is a deficient number, since it is larger than the sum of its proper divisors (192043).

2021357 is a wasteful number, since it uses less digits than its factorization.

2021357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 2021357 is about 1421.7443511405. The cubic root of 2021357 is about 126.4389869655.

Adding to 2021357 its reverse (7531202), we get a palindrome (9552559).

The spelling of 2021357 in words is "two million, twenty-one thousand, three hundred fifty-seven".