1321100100 has 54 divisors (see below), whose sum is σ = 4140917690. Its totient is φ = 352293120.

The previous prime is 1321100087. The next prime is 1321100113. The reversal of 1321100100 is 10011231.

1321100100 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1321100087) and next prime (1321100113).

It can be written as a sum of positive squares in 3 ways, for example, as 309478464 + 1011621636 = 17592^2 + 31806^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 733045 + ... + 734844.

Almost surely, 2^1321100100 is an apocalyptic number.

1321100100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321100100 is an abundant number, since it is smaller than the sum of its proper divisors (2819817590).

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

1321100100 is a wasteful number, since it uses less digits than its factorization.

1321100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467909 (or 1467899 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1321100100 is about 36346.9407240830. The cubic root of 1321100100 is about 1097.2659650444.

Adding to 1321100100 its reverse (10011231), we get a palindrome (1331111331).

The spelling of 1321100100 in words is "one billion, three hundred twenty-one million, one hundred thousand, one hundred".