51222351220 has 48 divisors (see below), whose sum is σ = 109885708800. Its totient is φ = 20047509504.

The previous prime is 51222351209. The next prime is 51222351223. The reversal of 51222351220 is 2215322215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51222351223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5952481 + ... + 5961079.

It is an arithmetic number, because the mean of its divisors is an integer number (2289285600).

Almost surely, 2^51222351220 is an apocalyptic number.

It is an amenable number.

51222351220 is an abundant number, since it is smaller than the sum of its proper divisors (58663357580).

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

51222351220 is a wasteful number, since it uses less digits than its factorization.

51222351220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14992 (or 14990 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 51222351220 its reverse (2215322215), we get a palindrome (53437673435).

The spelling of 51222351220 in words is "fifty-one billion, two hundred twenty-two million, three hundred fifty-one thousand, two hundred twenty".