51213210212 has 6 divisors (see below), whose sum is σ = 89623117878. Its totient is φ = 25606605104.

The previous prime is 51213210197. The next prime is 51213210221. The reversal of 51213210212 is 21201231215.

51213210212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 45477268516 + 5735941696 = 213254^2 + 75736^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6401651273 + ... + 6401651280.

It is an arithmetic number, because the mean of its divisors is an integer number (14937186313).

Almost surely, 2^51213210212 is an apocalyptic number.

It is an amenable number.

51213210212 is a deficient number, since it is larger than the sum of its proper divisors (38409907666).

51213210212 is a wasteful number, since it uses less digits than its factorization.

51213210212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12803302557 (or 12803302555 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 51213210212 its reverse (21201231215), we get a palindrome (72414441427).

The spelling of 51213210212 in words is "fifty-one billion, two hundred thirteen million, two hundred ten thousand, two hundred twelve".