321201110100 has 144 divisors (see below), whose sum is σ = 1009688000832. Its totient is φ = 78365091840.

The previous prime is 321201110089. The next prime is 321201110107. The reversal of 321201110100 is 1011102123.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321201110107) 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 47 ways as a sum of consecutive naturals, for example, 76279 + ... + 805121.

It is an arithmetic number, because the mean of its divisors is an integer number (7011722228).

Almost surely, 2^321201110100 is an apocalyptic number.

321201110100 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 321201110100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (504844000416).

321201110100 is an abundant number, since it is smaller than the sum of its proper divisors (688486890732).

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

321201110100 is a wasteful number, since it uses less digits than its factorization.

321201110100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728986 (or 728979 counting only the distinct ones).

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

Adding to 321201110100 its reverse (1011102123), we get a palindrome (322212212223).

The spelling of 321201110100 in words is "three hundred twenty-one billion, two hundred one million, one hundred ten thousand, one hundred".