21200333312 has 40 divisors (see below), whose sum is σ = 42517005300. Its totient is φ = 10560692224.

The previous prime is 21200333281. The next prime is 21200333321. The reversal of 21200333312 is 21333300212.

It can be written as a sum of positive squares in 2 ways, for example, as 16552366336 + 4647966976 = 128656^2 + 68176^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60764 + ... + 214692.

Almost surely, 2^21200333312 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 21200333312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21258502650).

21200333312 is an abundant number, since it is smaller than the sum of its proper divisors (21316671988).

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

21200333312 is an equidigital number, since it uses as much as digits as its factorization.

21200333312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154216 (or 154200 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21200333312 its reverse (21333300212), we get a palindrome (42533633524).

The spelling of 21200333312 in words is "twenty-one billion, two hundred million, three hundred thirty-three thousand, three hundred twelve".