3123001021200 has 120 divisors (see below), whose sum is σ = 10530540362400. Its totient is φ = 788968673280.

The previous prime is 3123001021199. The next prime is 3123001021207. The reversal of 3123001021200 is 21201003213.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 3123001021200.

It is not an unprimeable number, because it can be changed into a prime (3123001021207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68464065 + ... + 68509664.

It is an arithmetic number, because the mean of its divisors is an integer number (87754503020).

Almost surely, 2^{3123001021200} is an apocalyptic number.

3123001021200 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3123001021200 is an abundant number, since it is smaller than the sum of its proper divisors (7407539341200).

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

3123001021200 is a wasteful number, since it uses less digits than its factorization.

3123001021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136973769 (or 136973758 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 3123001021200 its reverse (21201003213), we get a palindrome (3144202024413).

The spelling of 3123001021200 in words is "three trillion, one hundred twenty-three billion, one million, twenty-one thousand, two hundred".