51222152412 has 120 divisors (see below), whose sum is σ = 134876117376. Its totient is φ = 16950684672.

The previous prime is 51222152411. The next prime is 51222152417. The reversal of 51222152412 is 21425122215.

51222152412 is a `hidden beast` number, since 5 + 122 + 2 + 1 + 524 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51222152411) 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 39 ways as a sum of consecutive naturals, for example, 32687253 + ... + 32688819.

Almost surely, 2^51222152412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51222152412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67438058688).

51222152412 is an abundant number, since it is smaller than the sum of its proper divisors (83653964964).

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

51222152412 is a wasteful number, since it uses less digits than its factorization.

51222152412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249 (or 2238 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

Adding to 51222152412 its reverse (21425122215), we get a palindrome (72647274627).

The spelling of 51222152412 in words is "fifty-one billion, two hundred twenty-two million, one hundred fifty-two thousand, four hundred twelve".