212013021204 has 36 divisors (see below), whose sum is σ = 535967888820. Its totient is φ = 70664929920.

The previous prime is 212013021203. The next prime is 212013021221. The reversal of 212013021204 is 402120310212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 97782540804 + 114230480400 = 312702^2 + 337980^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212013021203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181464 + ... + 675984.

Almost surely, 2^212013021204 is an apocalyptic number.

It is an amenable number.

212013021204 is an abundant number, since it is smaller than the sum of its proper divisors (323954867616).

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

212013021204 is a wasteful number, since it uses less digits than its factorization.

212013021204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506440 (or 506435 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 212013021204 its reverse (402120310212), we get a palindrome (614133331416).

The spelling of 212013021204 in words is "two hundred twelve billion, thirteen million, twenty-one thousand, two hundred four".