2021323257 has 6 divisors (see below), whose sum is σ = 2919689162. Its totient is φ = 1347548832.

The previous prime is 2021323253. The next prime is 2021323261. The reversal of 2021323257 is 7523231202.

It is a happy number.

2021323257 is a `hidden beast` number, since 202 + 132 + 325 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (2021323253) and next prime (2021323261).

It can be written as a sum of positive squares in only one way, i.e., 1155728016 + 865595241 = 33996^2 + 29421^2 .

It is not a de Polignac number, because 2021323257 - 2² = 2021323253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021323257.

It is not an unprimeable number, because it can be changed into a prime (2021323253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112295728 + ... + 112295745.

Almost surely, 2^2021323257 is an apocalyptic number.

It is an amenable number.

2021323257 is a deficient number, since it is larger than the sum of its proper divisors (898365905).

2021323257 is a wasteful number, since it uses less digits than its factorization.

2021323257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224591479 (or 224591476 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 2021323257 is about 44959.1287393339. The cubic root of 2021323257 is about 1264.3828340271.

Adding to 2021323257 its reverse (7523231202), we get a palindrome (9544554459).

The spelling of 2021323257 in words is "two billion, twenty-one million, three hundred twenty-three thousand, two hundred fifty-seven".