21200030120 has 64 divisors (see below), whose sum is σ = 50517025920. Its totient is φ = 7990228224.

The previous prime is 21200030113. The next prime is 21200030129. The reversal of 21200030120 is 2103000212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21200030129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110327 + ... + 233606.

It is an arithmetic number, because the mean of its divisors is an integer number (789328530).

Almost surely, 2^21200030120 is an apocalyptic number.

21200030120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200030120 is an abundant number, since it is smaller than the sum of its proper divisors (29316995800).

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

21200030120 is a wasteful number, since it uses less digits than its factorization.

21200030120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344034 (or 344030 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21200030120 its reverse (2103000212), we get a palindrome (23303030332).

The spelling of 21200030120 in words is "twenty-one billion, two hundred million, thirty thousand, one hundred twenty".