212122020004 has 36 divisors (see below), whose sum is σ = 381947962032. Its totient is φ = 103064809440.

The previous prime is 212122019981. The next prime is 212122020007. The reversal of 212122020004 is 400020221212.

It is a self number, because there is not a number n which added to its sum of digits gives 212122020004.

It is not an unprimeable number, because it can be changed into a prime (212122020007) 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 in 11 ways as a sum of consecutive naturals, for example, 1149519 + ... + 1321225.

It is an arithmetic number, because the mean of its divisors is an integer number (10609665612).

Almost surely, 2^212122020004 is an apocalyptic number.

It is an amenable number.

212122020004 is a deficient number, since it is larger than the sum of its proper divisors (169825942028).

212122020004 is a wasteful number, since it uses less digits than its factorization.

212122020004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171916 (or 171853 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 212122020004 its reverse (400020221212), we get a palindrome (612142241216).

The spelling of 212122020004 in words is "two hundred twelve billion, one hundred twenty-two million, twenty thousand, four".