1321000100 has 36 divisors (see below), whose sum is σ = 3276081984. Its totient is φ = 452914080.

The previous prime is 1321000081. The next prime is 1321000127. The reversal of 1321000100 is 10001231.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 942872 + ... + 944271.

Almost surely, 2^1321000100 is an apocalyptic number.

1321000100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321000100 is an abundant number, since it is smaller than the sum of its proper divisors (1955081884).

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

1321000100 is a wasteful number, since it uses less digits than its factorization.

1321000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887164 (or 1887157 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 1321000100 is about 36345.5650664562. The cubic root of 1321000100 is about 1097.2382786828.

Adding to 1321000100 its reverse (10001231), we get a palindrome (1331001331).

The spelling of 1321000100 in words is "one billion, three hundred twenty-one million, one hundred", and thus it is an aban number.