21200111002 has 24 divisors (see below), whose sum is σ = 36420718176. Its totient is φ = 9066366144.

The previous prime is 21200110963. The next prime is 21200111003. The reversal of 21200111002 is 20011100212.

It is a self number, because there is not a number n which added to its sum of digits gives 21200111002.

It is not an unprimeable number, because it can be changed into a prime (21200111003) 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, 14237074 + ... + 14238562.

It is an arithmetic number, because the mean of its divisors is an integer number (1517529924).

Almost surely, 2^21200111002 is an apocalyptic number.

21200111002 is a deficient number, since it is larger than the sum of its proper divisors (15220607174).

21200111002 is an frugal number, since it uses more digits than its factorization.

21200111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3670 (or 2181 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21200111002 its reverse (20011100212), we get a palindrome (41211211214).

The spelling of 21200111002 in words is "twenty-one billion, two hundred million, one hundred eleven thousand, two".