1681321100 has 18 divisors (see below), whose sum is σ = 3648467004. Its totient is φ = 672528400.

The previous prime is 1681321093. The next prime is 1681321121. The reversal of 1681321100 is 11231861.

It is a super-3 number, since 3×1681321100³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8406506 + ... + 8406705.

Almost surely, 2^1681321100 is an apocalyptic number.

1681321100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681321100 is an abundant number, since it is smaller than the sum of its proper divisors (1967145904).

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

1681321100 is a wasteful number, since it uses less digits than its factorization.

1681321100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16813225 (or 16813218 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1681321100 is about 41003.9156666775. The cubic root of 1681321100 is about 1189.0959166584.

Adding to 1681321100 its reverse (11231861), we get a palindrome (1692552961).

The spelling of 1681321100 in words is "one billion, six hundred eighty-one million, three hundred twenty-one thousand, one hundred".