51021154240 has 56 divisors (see below), whose sum is σ = 138850432992. Its totient is φ = 17492966400.

The previous prime is 51021154229. The next prime is 51021154241. The reversal of 51021154240 is 4245112015.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021154241) 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, 11386411 + ... + 11390890.

Almost surely, 2^51021154240 is an apocalyptic number.

It is an amenable number.

51021154240 is an abundant number, since it is smaller than the sum of its proper divisors (87829278752).

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

51021154240 is a wasteful number, since it uses less digits than its factorization.

51021154240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22777325 (or 22777315 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 51021154240 its reverse (4245112015), we get a palindrome (55266266255).

The spelling of 51021154240 in words is "fifty-one billion, twenty-one million, one hundred fifty-four thousand, two hundred forty".