2121200004 has 72 divisors (see below), whose sum is σ = 6280975008. Its totient is φ = 550959360.

The previous prime is 2121199999. The next prime is 2121200021. The reversal of 2121200004 is 4000021212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157509 + ... + 170444.

It is an arithmetic number, because the mean of its divisors is an integer number (87235764).

Almost surely, 2^2121200004 is an apocalyptic number.

It is an amenable number.

2121200004 is an abundant number, since it is smaller than the sum of its proper divisors (4159775004).

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

2121200004 is a wasteful number, since it uses less digits than its factorization.

2121200004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327985 (or 327976 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2121200004 is about 46056.4871000818. The cubic root of 2121200004 is about 1284.8739961334.

Adding to 2121200004 its reverse (4000021212), we get a palindrome (6121221216).

The spelling of 2121200004 in words is "two billion, one hundred twenty-one million, two hundred thousand, four".