51220040100 has 36 divisors (see below), whose sum is σ = 148196650224. Its totient is φ = 13658677280.

The previous prime is 51220040093. The next prime is 51220040101. The reversal of 51220040100 is 104002215.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 51220040100.

It is not an unprimeable number, because it can be changed into a prime (51220040101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85366434 + ... + 85367033.

Almost surely, 2^51220040100 is an apocalyptic number.

51220040100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51220040100 is an abundant number, since it is smaller than the sum of its proper divisors (96976610124).

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

51220040100 is a wasteful number, since it uses less digits than its factorization.

51220040100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170733484 (or 170733477 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 51220040100 its reverse (104002215), we get a palindrome (51324042315).

The spelling of 51220040100 in words is "fifty-one billion, two hundred twenty million, forty thousand, one hundred".