213121213212 has 24 divisors (see below), whose sum is σ = 508847549056. Its totient is φ = 69388301808.

The previous prime is 213121213189. The next prime is 213121213223. The reversal of 213121213212 is 212312121312.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206512288 + ... + 206513319.

Almost surely, 2^213121213212 is an apocalyptic number.

It is an amenable number.

213121213212 is an abundant number, since it is smaller than the sum of its proper divisors (295726335844).

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

213121213212 is a wasteful number, since it uses less digits than its factorization.

213121213212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413025657 (or 413025655 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

Adding to 213121213212 its reverse (212312121312), we get a palindrome (425433334524).

The spelling of 213121213212 in words is "two hundred thirteen billion, one hundred twenty-one million, two hundred thirteen thousand, two hundred twelve".