51140212040 has 32 divisors (see below), whose sum is σ = 120068326080. Its totient is φ = 19566689472.

The previous prime is 51140212021. The next prime is 51140212043. The reversal of 51140212040 is 4021204115.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (51140212043) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27792674 + ... + 27794513.

It is an arithmetic number, because the mean of its divisors is an integer number (3752135190).

Almost surely, 2^51140212040 is an apocalyptic number.

It is an amenable number.

51140212040 is an abundant number, since it is smaller than the sum of its proper divisors (68928114040).

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

51140212040 is a wasteful number, since it uses less digits than its factorization.

51140212040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55587221 (or 55587217 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 51140212040 its reverse (4021204115), we get a palindrome (55161416155).

The spelling of 51140212040 in words is "fifty-one billion, one hundred forty million, two hundred twelve thousand, forty".