51211053500 has 24 divisors (see below), whose sum is σ = 111844941936. Its totient is φ = 20484421200.

The previous prime is 51211053461. The next prime is 51211053503. The reversal of 51211053500 is 535011215.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51211053503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51210554 + ... + 51211553.

It is an arithmetic number, because the mean of its divisors is an integer number (4660205914).

Almost surely, 2^51211053500 is an apocalyptic number.

51211053500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51211053500 is an abundant number, since it is smaller than the sum of its proper divisors (60633888436).

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

51211053500 is a wasteful number, since it uses less digits than its factorization.

51211053500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102422126 (or 102422114 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 23.

Adding to 51211053500 its reverse (535011215), we get a palindrome (51746064715).

The spelling of 51211053500 in words is "fifty-one billion, two hundred eleven million, fifty-three thousand, five hundred".