51242032220 has 12 divisors (see below), whose sum is σ = 107608267704. Its totient is φ = 20496812880.

The previous prime is 51242032207. The next prime is 51242032223. The reversal of 51242032220 is 2223024215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51242032223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281050786 + ... + 1281050825.

It is an arithmetic number, because the mean of its divisors is an integer number (8967355642).

Almost surely, 2^51242032220 is an apocalyptic number.

It is an amenable number.

51242032220 is an abundant number, since it is smaller than the sum of its proper divisors (56366235484).

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

51242032220 is a wasteful number, since it uses less digits than its factorization.

51242032220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562101620 (or 2562101618 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 51242032220 its reverse (2223024215), we get a palindrome (53465056435).

The spelling of 51242032220 in words is "fifty-one billion, two hundred forty-two million, thirty-two thousand, two hundred twenty".