1608336021 has 4 divisors (see below), whose sum is σ = 2144448032. Its totient is φ = 1072224012.

The previous prime is 1608336011. The next prime is 1608336031. The reversal of 1608336021 is 1206338061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1608336011) and next prime (1608336031).

It is not a de Polignac number, because 1608336021 - 2¹¹ = 1608333973 is a prime.

It is a super-2 number, since 2×1608336021² = 5173489512892224882, which contains 22 as substring.

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 1608336021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1608336011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268056001 + ... + 268056006.

It is an arithmetic number, because the mean of its divisors is an integer number (536112008).

Almost surely, 2^1608336021 is an apocalyptic number.

It is an amenable number.

1608336021 is a deficient number, since it is larger than the sum of its proper divisors (536112011).

1608336021 is an equidigital number, since it uses as much as digits as its factorization.

1608336021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536112010.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1608336021 is about 40104.0648937237. The cubic root of 1608336021 is about 1171.6348006669.

The spelling of 1608336021 in words is "one billion, six hundred eight million, three hundred thirty-six thousand, twenty-one".