21012333200 has 120 divisors (see below), whose sum is σ = 55176468480. Its totient is φ = 7655270400.

The previous prime is 21012333197. The next prime is 21012333227. The reversal of 21012333200 is 233321012.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160961 + ... + 260639.

It is an arithmetic number, because the mean of its divisors is an integer number (459803904).

Almost surely, 2^21012333200 is an apocalyptic number.

21012333200 is a gapful number since it is divisible by the number (20) 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 21012333200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27588234240).

21012333200 is an abundant number, since it is smaller than the sum of its proper divisors (34164135280).

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

21012333200 is a wasteful number, since it uses less digits than its factorization.

21012333200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99745 (or 99734 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21012333200 its reverse (233321012), we get a palindrome (21245654212).

The spelling of 21012333200 in words is "twenty-one billion, twelve million, three hundred thirty-three thousand, two hundred".