1321023100 has 36 divisors (see below), whose sum is σ = 2868252184. Its totient is φ = 528108480.

The previous prime is 1321023061. The next prime is 1321023107. The reversal of 1321023100 is 13201231.

It is a super-2 number, since 2×1321023100² = 3490204061467220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321023107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277339 + ... + 282061.

Almost surely, 2^1321023100 is an apocalyptic number.

1321023100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321023100 is an abundant number, since it is smaller than the sum of its proper divisors (1547229084).

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

1321023100 is a wasteful number, since it uses less digits than its factorization.

1321023100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7534 (or 7527 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1321023100 is about 36345.8814723209. The cubic root of 1321023100 is about 1097.2446466697.

Adding to 1321023100 its reverse (13201231), we get a palindrome (1334224331).

The spelling of 1321023100 in words is "one billion, three hundred twenty-one million, twenty-three thousand, one hundred".