51100144220 has 12 divisors (see below), whose sum is σ = 107310302904. Its totient is φ = 20440057680.

The previous prime is 51100144169. The next prime is 51100144253. The reversal of 51100144220 is 2244100115.

It is a happy number.

It is a super-2 number, since 2×51100144220² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 2555007211 = 51100144220 / (5 + 1 + 1 + 0 + 0 + 1 + 4 + 4 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 51100144192 and 51100144201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277503586 + ... + 1277503625.

It is an arithmetic number, because the mean of its divisors is an integer number (8942525242).

Almost surely, 2^51100144220 is an apocalyptic number.

It is an amenable number.

51100144220 is an abundant number, since it is smaller than the sum of its proper divisors (56210158684).

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

51100144220 is a wasteful number, since it uses less digits than its factorization.

51100144220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555007220 (or 2555007218 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 51100144220 its reverse (2244100115), we get a palindrome (53344244335).

The spelling of 51100144220 in words is "fifty-one billion, one hundred million, one hundred forty-four thousand, two hundred twenty".