2021630365 has 4 divisors (see below), whose sum is σ = 2425956444. Its totient is φ = 1617304288.

The previous prime is 2021630321. The next prime is 2021630371. The reversal of 2021630365 is 5630361202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 646481476 + 1375148889 = 25426^2 + 37083^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021630365 - 2²⁵ = 1988075933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202163032 + ... + 202163041.

It is an arithmetic number, because the mean of its divisors is an integer number (606489111).

Almost surely, 2^2021630365 is an apocalyptic number.

It is an amenable number.

2021630365 is a deficient number, since it is larger than the sum of its proper divisors (404326079).

2021630365 is an equidigital number, since it uses as much as digits as its factorization.

2021630365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404326078.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 2021630365 is about 44962.5440227752. The cubic root of 2021630365 is about 1264.4468650883.

Adding to 2021630365 its reverse (5630361202), we get a palindrome (7651991567).

The spelling of 2021630365 in words is "two billion, twenty-one million, six hundred thirty thousand, three hundred sixty-five".