51010420212 has 18 divisors (see below), whose sum is σ = 128943006738. Its totient is φ = 17003473392.

The previous prime is 51010420189. The next prime is 51010420229. The reversal of 51010420212 is 21202401015.

It can be written as a sum of positive squares in only one way, i.e., 49941522576 + 1068897636 = 223476^2 + 32694^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 708478023 + ... + 708478094.

Almost surely, 2^51010420212 is an apocalyptic number.

It is an amenable number.

51010420212 is an abundant number, since it is smaller than the sum of its proper divisors (77932586526).

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

51010420212 is a wasteful number, since it uses less digits than its factorization.

51010420212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416956127 (or 1416956122 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 51010420212 its reverse (21202401015), we get a palindrome (72212821227).

The spelling of 51010420212 in words is "fifty-one billion, ten million, four hundred twenty thousand, two hundred twelve".