2101504 has 18 divisors (see below), whose sum is σ = 4195310. Its totient is φ = 1050624.

The previous prime is 2101501. The next prime is 2101513. The reversal of 2101504 is 4051012.

It can be written as a sum of positive squares in only one way, i.e., 1327104 + 774400 = 1152^2 + 880^2 .

It is not an unprimeable number, because it can be changed into a prime (2101501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3849 + ... + 4360.

2^2101504 is an apocalyptic number.

It is an amenable number.

2101504 is a deficient number, since it is larger than the sum of its proper divisors (2093806).

2101504 is an frugal number, since it uses more digits than its factorization.

2101504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8225 (or 8211 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 2101504 is about 1449.6565110398. The cubic root of 2101504 is about 128.0884804901.

Adding to 2101504 its reverse (4051012), we get a palindrome (6152516).

The spelling of 2101504 in words is "two million, one hundred one thousand, five hundred four".