21700020200 has 48 divisors (see below), whose sum is σ = 51091224000. Its totient is φ = 8570128320.

The previous prime is 21700020191. The next prime is 21700020203. The reversal of 21700020200 is 202000712.

It is not an unprimeable number, because it can be changed into a prime (21700020203) 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, 670910 + ... + 702509.

It is an arithmetic number, because the mean of its divisors is an integer number (1064400500).

Almost surely, 2^21700020200 is an apocalyptic number.

21700020200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21700020200 is an abundant number, since it is smaller than the sum of its proper divisors (29391203800).

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

21700020200 is a wasteful number, since it uses less digits than its factorization.

21700020200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373514 (or 1373505 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 14.

Adding to 21700020200 its reverse (202000712), we get a palindrome (21902020912).

The spelling of 21700020200 in words is "twenty-one billion, seven hundred million, twenty thousand, two hundred".