321020100 has 108 divisors (see below), whose sum is σ = 1016282176. Its totient is φ = 84749760.

The previous prime is 321020093. The next prime is 321020101. The reversal of 321020100 is 1020123.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (321020101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 90969 + ... + 94431.

Almost surely, 2^321020100 is an apocalyptic number.

321020100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321020100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (508141088).

321020100 is an abundant number, since it is smaller than the sum of its proper divisors (695262076).

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

321020100 is a wasteful number, since it uses less digits than its factorization.

321020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3586 (or 3576 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 321020100 is about 17917.0337946882. The cubic root of 321020100 is about 684.7164187495.

Adding to 321020100 its reverse (1020123), we get a palindrome (322040223).

The spelling of 321020100 in words is "three hundred twenty-one million, twenty thousand, one hundred".