21020331200 has 336 divisors, whose sum is σ = 59323345920. Its totient is φ = 7260672000.

The previous prime is 21020331197. The next prime is 21020331223. The reversal of 21020331200 is 213302012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32190074 + ... + 32190726.

Almost surely, 2^21020331200 is an apocalyptic number.

21020331200 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 21020331200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29661672960).

21020331200 is an abundant number, since it is smaller than the sum of its proper divisors (38303014720).

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

21020331200 is a wasteful number, since it uses less digits than its factorization.

21020331200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21020331200 its reverse (213302012), we get a palindrome (21233633212).

The spelling of 21020331200 in words is "twenty-one billion, twenty million, three hundred thirty-one thousand, two hundred".