21020003200 has 96 divisors (see below), whose sum is σ = 59344036560. Its totient is φ = 7206850560.

The previous prime is 21020003159. The next prime is 21020003201. The reversal of 21020003200 is 230002012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020003201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 446797 + ... + 491596.

Almost surely, 2^21020003200 is an apocalyptic number.

21020003200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020003200 is an abundant number, since it is smaller than the sum of its proper divisors (38324033360).

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

21020003200 is an equidigital number, since it uses as much as digits as its factorization.

21020003200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938424 (or 938407 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

Adding to 21020003200 its reverse (230002012), we get a palindrome (21250005212).

The spelling of 21020003200 in words is "twenty-one billion, twenty million, three thousand, two hundred".