321012120100 has 144 divisors (see below), whose sum is σ = 839291781888. Its totient is φ = 104190197760.

The previous prime is 321012120089. The next prime is 321012120131. The reversal of 321012120100 is 1021210123.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1458924 + ... + 1664476.

It is an arithmetic number, because the mean of its divisors is an integer number (5828415152).

Almost surely, 2^321012120100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321012120100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419645890944).

321012120100 is an abundant number, since it is smaller than the sum of its proper divisors (518279661788).

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

321012120100 is a wasteful number, since it uses less digits than its factorization.

321012120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205694 (or 205687 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 321012120100 its reverse (1021210123), we get a palindrome (322033330223).

The spelling of 321012120100 in words is "three hundred twenty-one billion, twelve million, one hundred twenty thousand, one hundred".