51510310220 has 48 divisors (see below), whose sum is σ = 109446120000. Its totient is φ = 20362763520.

The previous prime is 51510310211. The next prime is 51510310237. The reversal of 51510310220 is 2201301515.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 51510310192 and 51510310201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 549590 + ... + 636450.

It is an arithmetic number, because the mean of its divisors is an integer number (2280127500).

Almost surely, 2^51510310220 is an apocalyptic number.

It is an amenable number.

51510310220 is an abundant number, since it is smaller than the sum of its proper divisors (57935809780).

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

51510310220 is a wasteful number, since it uses less digits than its factorization.

51510310220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87218 (or 87216 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

Adding to 51510310220 its reverse (2201301515), we get a palindrome (53711611735).

The spelling of 51510310220 in words is "fifty-one billion, five hundred ten million, three hundred ten thousand, two hundred twenty".