21200123210 has 64 divisors (see below), whose sum is σ = 44602168320. Its totient is φ = 7105363200.

The previous prime is 21200123177. The next prime is 21200123213. The reversal of 21200123210 is 1232100212.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21200123213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 539552 + ... + 577508.

It is an arithmetic number, because the mean of its divisors is an integer number (696908880).

Almost surely, 2^21200123210 is an apocalyptic number.

21200123210 is an abundant number, since it is smaller than the sum of its proper divisors (23402045110).

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

21200123210 is a wasteful number, since it uses less digits than its factorization.

21200123210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38151.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21200123210 its reverse (1232100212), we get a palindrome (22432223422).

The spelling of 21200123210 in words is "twenty-one billion, two hundred million, one hundred twenty-three thousand, two hundred ten".