2021604 has 24 divisors (see below), whose sum is σ = 5080320. Its totient is φ = 621984.

The previous prime is 2021599. The next prime is 2021609. The reversal of 2021604 is 4061202.

It is an interprime number because it is at equal distance from previous prime (2021599) and next prime (2021609).

It is not an unprimeable number, because it can be changed into a prime (2021609) 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, 6324 + ... + 6635.

It is an arithmetic number, because the mean of its divisors is an integer number (211680).

2^2021604 is an apocalyptic number.

It is an amenable number.

2021604 is an abundant number, since it is smaller than the sum of its proper divisors (3058716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021604 is a wasteful number, since it uses less digits than its factorization.

2021604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12979 (or 12977 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2021604 is about 1421.8312136115. The cubic root of 2021604 is about 126.4441368322. Note that the first 3 decimals are identical.

Adding to 2021604 its reverse (4061202), we get a palindrome (6082806).

The spelling of 2021604 in words is "two million, twenty-one thousand, six hundred four".