51101751821 has 8 divisors (see below), whose sum is σ = 51228732960. Its totient is φ = 50974875952.

The previous prime is 51101751809. The next prime is 51101751823. The reversal of 51101751821 is 12815710115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51101751821 is a prime.

It is a super-2 number, since 2×51101751821² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51101751823) 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, 994466 + ... + 1044588.

It is an arithmetic number, because the mean of its divisors is an integer number (6403591620).

Almost surely, 2^51101751821 is an apocalyptic number.

It is an amenable number.

51101751821 is a deficient number, since it is larger than the sum of its proper divisors (126981139).

51101751821 is a wasteful number, since it uses less digits than its factorization.

51101751821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52635.

The product of its (nonzero) digits is 2800, while the sum is 32.

The spelling of 51101751821 in words is "fifty-one billion, one hundred one million, seven hundred fifty-one thousand, eight hundred twenty-one".