21031210233200 has 120 divisors (see below), whose sum is σ = 51795387146448. Its totient is φ = 8202089226240.

The previous prime is 21031210233197. The next prime is 21031210233203. The reversal of 21031210233200 is 233201213012.

It is an interprime number because it is at equal distance from previous prime (21031210233197) and next prime (21031210233203).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031210233203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8482784 + ... + 10678016.

Almost surely, 2^{21031210233200} is an apocalyptic number.

21031210233200 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 21031210233200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25897693573224).

21031210233200 is an abundant number, since it is smaller than the sum of its proper divisors (30764176913248).

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

21031210233200 is a wasteful number, since it uses less digits than its factorization.

21031210233200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195851 (or 2195840 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21031210233200 its reverse (233201213012), we get a palindrome (21264411446212).

The spelling of 21031210233200 in words is "twenty-one trillion, thirty-one billion, two hundred ten million, two hundred thirty-three thousand, two hundred".