21283209216 has 304 divisors, whose sum is σ = 65766561280. Its totient is φ = 6794772480.

The previous prime is 21283209193. The next prime is 21283209251. The reversal of 21283209216 is 61290238212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219414480 + ... + 219414576.

Almost surely, 2^21283209216 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 21283209216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32883280640).

21283209216 is an abundant number, since it is smaller than the sum of its proper divisors (44483352064).

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

21283209216 is an frugal number, since it uses more digits than its factorization.

21283209216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21283209216 in words is "twenty-one billion, two hundred eighty-three million, two hundred nine thousand, two hundred sixteen".