51100010020 has 24 divisors (see below), whose sum is σ = 110771635968. Its totient is φ = 19780648800.

The previous prime is 51100010011. The next prime is 51100010033. The reversal of 51100010020 is 2001000115.

It is a happy number.

It is a super-2 number, since 2×51100010020² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 51100009979 and 51100010006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41209066 + ... + 41210305.

It is an arithmetic number, because the mean of its divisors is an integer number (4615484832).

Almost surely, 2^51100010020 is an apocalyptic number.

It is an amenable number.

51100010020 is an abundant number, since it is smaller than the sum of its proper divisors (59671625948).

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

51100010020 is a wasteful number, since it uses less digits than its factorization.

51100010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82419411 (or 82419409 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 10.

Adding to 51100010020 its reverse (2001000115), we get a palindrome (53101010135).

The spelling of 51100010020 in words is "fifty-one billion, one hundred million, ten thousand, twenty".