21020430200 has 96 divisors (see below), whose sum is σ = 60931992960. Its totient is φ = 6551817600.

The previous prime is 21020430199. The next prime is 21020430217. The reversal of 21020430200 is 203402012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 667082 + ... + 697881.

It is an arithmetic number, because the mean of its divisors is an integer number (634708260).

Almost surely, 2^21020430200 is an apocalyptic number.

21020430200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020430200 is an abundant number, since it is smaller than the sum of its proper divisors (39911562760).

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

21020430200 is a wasteful number, since it uses less digits than its factorization.

21020430200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364997 (or 1364988 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 21020430200 its reverse (203402012), we get a palindrome (21223832212).

The spelling of 21020430200 in words is "twenty-one billion, twenty million, four hundred thirty thousand, two hundred".