2021604245 has 4 divisors (see below), whose sum is σ = 2425925100. Its totient is φ = 1617283392.

The previous prime is 2021604227. The next prime is 2021604259. The reversal of 2021604245 is 5424061202.

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 734301604 + 1287302641 = 27098^2 + 35879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021604245 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202160420 + ... + 202160429.

It is an arithmetic number, because the mean of its divisors is an integer number (606481275).

Almost surely, 2^2021604245 is an apocalyptic number.

It is an amenable number.

2021604245 is a deficient number, since it is larger than the sum of its proper divisors (404320855).

2021604245 is an equidigital number, since it uses as much as digits as its factorization.

2021604245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404320854.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 2021604245 is about 44962.2535578456. The cubic root of 2021604245 is about 1264.4414194020.

Adding to 2021604245 its reverse (5424061202), we get a palindrome (7445665447).

The spelling of 2021604245 in words is "two billion, twenty-one million, six hundred four thousand, two hundred forty-five".