51210212 has 6 divisors (see below), whose sum is σ = 89617878. Its totient is φ = 25605104.

The previous prime is 51210209. The next prime is 51210217. The reversal of 51210212 is 21201215.

It can be written as a sum of positive squares in only one way, i.e., 50779876 + 430336 = 7126^2 + 656^2 .

It is not an unprimeable number, because it can be changed into a prime (51210217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6401273 + ... + 6401280.

It is an arithmetic number, because the mean of its divisors is an integer number (14936313).

Almost surely, 2^51210212 is an apocalyptic number.

It is an amenable number.

51210212 is a deficient number, since it is larger than the sum of its proper divisors (38407666).

51210212 is a wasteful number, since it uses less digits than its factorization.

51210212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12802557 (or 12802555 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 51210212 is about 7156.1310776145. The cubic root of 51210212 is about 371.3517924985.

Adding to 51210212 its reverse (21201215), we get a palindrome (72411427).

The spelling of 51210212 in words is "fifty-one million, two hundred ten thousand, two hundred twelve".