509894821212 has 96 divisors (see below), whose sum is σ = 1385695890432. Its totient is φ = 142902329856.

The previous prime is 509894821211. The next prime is 509894821213. The reversal of 509894821212 is 212128498905.

It is an interprime number because it is at equal distance from previous prime (509894821211) and next prime (509894821213).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509894821211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24105913 + ... + 24127055.

It is an arithmetic number, because the mean of its divisors is an integer number (14434332192).

Almost surely, 2^509894821212 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 509894821212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (692847945216).

509894821212 is an abundant number, since it is smaller than the sum of its proper divisors (875801069220).

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

509894821212 is a wasteful number, since it uses less digits than its factorization.

509894821212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26627 (or 26625 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 509894821212 in words is "five hundred nine billion, eight hundred ninety-four million, eight hundred twenty-one thousand, two hundred twelve".