51025020212 has 6 divisors (see below), whose sum is σ = 89293785378. Its totient is φ = 25512510104.

The previous prime is 51025020203. The next prime is 51025020227. The reversal of 51025020212 is 21202052015.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 47229720976 + 3795299236 = 217324^2 + 61606^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6378127523 + ... + 6378127530.

It is an arithmetic number, because the mean of its divisors is an integer number (14882297563).

Almost surely, 2^51025020212 is an apocalyptic number.

It is an amenable number.

51025020212 is a deficient number, since it is larger than the sum of its proper divisors (38268765166).

51025020212 is a wasteful number, since it uses less digits than its factorization.

51025020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12756255057 (or 12756255055 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 51025020212 its reverse (21202052015), we get a palindrome (72227072227).

The spelling of 51025020212 in words is "fifty-one billion, twenty-five million, twenty thousand, two hundred twelve".