51021924918 has 32 divisors (see below), whose sum is σ = 102394977120. Its totient is φ = 16948888320.

The previous prime is 51021924859. The next prime is 51021924977. The reversal of 51021924918 is 81942912015.

It is an interprime number because it is at equal distance from previous prime (51021924859) and next prime (51021924977).

It is a self number, because there is not a number n which added to its sum of digits gives 51021924918.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2104248 + ... + 2128356.

It is an arithmetic number, because the mean of its divisors is an integer number (3199843035).

Almost surely, 2^51021924918 is an apocalyptic number.

51021924918 is an abundant number, since it is smaller than the sum of its proper divisors (51373052202).

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

51021924918 is a wasteful number, since it uses less digits than its factorization.

51021924918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25312.

The product of its (nonzero) digits is 51840, while the sum is 42.

The spelling of 51021924918 in words is "fifty-one billion, twenty-one million, nine hundred twenty-four thousand, nine hundred eighteen".