21231010200 has 192 divisors, whose sum is σ = 71047238400. Its totient is φ = 5228608000.

The previous prime is 21231010169. The next prime is 21231010231. The reversal of 21231010200 is 201013212.

It is an interprime number because it is at equal distance from previous prime (21231010169) and next prime (21231010231).

It is a super-2 number, since 2×21231010200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 373675 + ... + 426725.

It is an arithmetic number, because the mean of its divisors is an integer number (370037700).

Almost surely, 2^21231010200 is an apocalyptic number.

21231010200 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 21231010200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35523619200).

21231010200 is an abundant number, since it is smaller than the sum of its proper divisors (49816228200).

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

21231010200 is a wasteful number, since it uses less digits than its factorization.

21231010200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53122 (or 53113 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21231010200 its reverse (201013212), we get a palindrome (21432023412).

The spelling of 21231010200 in words is "twenty-one billion, two hundred thirty-one million, ten thousand, two hundred".