2123212004 has 6 divisors (see below), whose sum is σ = 3715621014. Its totient is φ = 1061606000.

The previous prime is 2123211983. The next prime is 2123212009. The reversal of 2123212004 is 4002123212.

It can be written as a sum of positive squares in only one way, i.e., 1306967104 + 816244900 = 36152^2 + 28570^2 .

It is not an unprimeable number, because it can be changed into a prime (2123212009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265401497 + ... + 265401504.

It is an arithmetic number, because the mean of its divisors is an integer number (619270169).

Almost surely, 2^2123212004 is an apocalyptic number.

It is an amenable number.

2123212004 is a deficient number, since it is larger than the sum of its proper divisors (1592409010).

2123212004 is a wasteful number, since it uses less digits than its factorization.

2123212004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530803005 (or 530803003 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2123212004 is about 46078.3246657254. The cubic root of 2123212004 is about 1285.2801105255.

Adding to 2123212004 its reverse (4002123212), we get a palindrome (6125335216).

The spelling of 2123212004 in words is "two billion, one hundred twenty-three million, two hundred twelve thousand, four".