1821208010 has 16 divisors (see below), whose sum is σ = 3290365800. Its totient is φ = 725774016.

The previous prime is 1821207953. The next prime is 1821208013. The reversal of 1821208010 is 108021281.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 558329641 + 1262878369 = 23629^2 + 35537^2 .

It is not an unprimeable number, because it can be changed into a prime (1821208013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335825 + ... + 341204.

Almost surely, 2^1821208010 is an apocalyptic number.

1821208010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1821208010 is a deficient number, since it is larger than the sum of its proper divisors (1469157790).

1821208010 is a wasteful number, since it uses less digits than its factorization.

1821208010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677305.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 1821208010 is about 42675.6137624288. The cubic root of 1821208010 is about 1221.1992172241.

Adding to 1821208010 its reverse (108021281), we get a palindrome (1929229291).

The spelling of 1821208010 in words is "one billion, eight hundred twenty-one million, two hundred eight thousand, ten".