2131212004 has 36 divisors (see below), whose sum is σ = 3991131396. Its totient is φ = 995528704.

The previous prime is 2131211989. The next prime is 2131212023. The reversal of 2131212004 is 4002121312.

It can be written as a sum of positive squares in 6 ways, for example, as 933913600 + 1197298404 = 30560^2 + 34602^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151644 + ... + 165100.

It is an arithmetic number, because the mean of its divisors is an integer number (110864761).

Almost surely, 2^2131212004 is an apocalyptic number.

It is an amenable number.

2131212004 is a deficient number, since it is larger than the sum of its proper divisors (1859919392).

2131212004 is a wasteful number, since it uses less digits than its factorization.

2131212004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13632 (or 13613 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2131212004 is about 46165.0517599623. The cubic root of 2131212004 is about 1286.8923461006.

Adding to 2131212004 its reverse (4002121312), we get a palindrome (6133333316).

The spelling of 2131212004 in words is "two billion, one hundred thirty-one million, two hundred twelve thousand, four".