51121244240 has 40 divisors (see below), whose sum is σ = 129662067168. Its totient is φ = 18589543040.

The previous prime is 51121244227. The next prime is 51121244243. The reversal of 51121244240 is 4244212115.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×51121244240² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121244243) 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, 29045282 + ... + 29047041.

Almost surely, 2^51121244240 is an apocalyptic number.

It is an amenable number.

51121244240 is an abundant number, since it is smaller than the sum of its proper divisors (78540822928).

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

51121244240 is a wasteful number, since it uses less digits than its factorization.

51121244240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58092347 (or 58092341 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 51121244240 its reverse (4244212115), we get a palindrome (55365456355).

The spelling of 51121244240 in words is "fifty-one billion, one hundred twenty-one million, two hundred forty-four thousand, two hundred forty".