51381907212 has 24 divisors (see below), whose sum is σ = 120584133936. Its totient is φ = 17028299968.

The previous prime is 51381907189. The next prime is 51381907267. The reversal of 51381907212 is 21270918315.

It is a happy number.

It is a super-2 number, since 2×51381907212² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12373143 + ... + 12377294.

It is an arithmetic number, because the mean of its divisors is an integer number (5024338914).

Almost surely, 2^51381907212 is an apocalyptic number.

It is an amenable number.

51381907212 is an abundant number, since it is smaller than the sum of its proper divisors (69202226724).

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

51381907212 is a wasteful number, since it uses less digits than its factorization.

51381907212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24750617 (or 24750615 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 51381907212 in words is "fifty-one billion, three hundred eighty-one million, nine hundred seven thousand, two hundred twelve".