16821415212 has 72 divisors (see below), whose sum is σ = 45728464320. Its totient is φ = 4798715040.

The previous prime is 16821415189. The next prime is 16821415213. The reversal of 16821415212 is 21251412861.

It is not an unprimeable number, because it can be changed into a prime (16821415213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 365787 + ... + 409197.

It is an arithmetic number, because the mean of its divisors is an integer number (635117560).

Almost surely, 2^16821415212 is an apocalyptic number.

16821415212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16821415212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22864232160).

16821415212 is an abundant number, since it is smaller than the sum of its proper divisors (28907049108).

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

16821415212 is a wasteful number, since it uses less digits than its factorization.

16821415212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44091 (or 44082 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The spelling of 16821415212 in words is "sixteen billion, eight hundred twenty-one million, four hundred fifteen thousand, two hundred twelve".