21102231200 has 72 divisors (see below), whose sum is σ = 51597197568. Its totient is φ = 8427559680.

The previous prime is 21102231181. The next prime is 21102231203. The reversal of 21102231200 is 213220112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21102231203) 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, 493889 + ... + 534911.

It is an arithmetic number, because the mean of its divisors is an integer number (716627744).

Almost surely, 2^21102231200 is an apocalyptic number.

21102231200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102231200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25798598784).

21102231200 is an abundant number, since it is smaller than the sum of its proper divisors (30494966368).

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

21102231200 is a wasteful number, since it uses less digits than its factorization.

21102231200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41686 (or 41673 counting only the distinct ones).

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

Adding to 21102231200 its reverse (213220112), we get a palindrome (21315451312).

The spelling of 21102231200 in words is "twenty-one billion, one hundred two million, two hundred thirty-one thousand, two hundred".