321012100 has 18 divisors (see below), whose sum is σ = 696596474. Its totient is φ = 128404800.

The previous prime is 321012077. The next prime is 321012113. The reversal of 321012100 is 1210123.

It can be written as a sum of positive squares in 3 ways, for example, as 24621444 + 296390656 = 4962^2 + 17216^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1604961 + ... + 1605160.

Almost surely, 2^321012100 is an apocalyptic number.

It is an amenable number.

321012100 is an abundant number, since it is smaller than the sum of its proper divisors (375584374).

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

321012100 is a wasteful number, since it uses less digits than its factorization.

321012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210135 (or 3210128 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 321012100 is about 17916.8105420580. The cubic root of 321012100 is about 684.7107308638.

Adding to 321012100 its reverse (1210123), we get a palindrome (322222223).

The spelling of 321012100 in words is "three hundred twenty-one million, twelve thousand, one hundred".