21031210200 has 1152 divisors, whose sum is σ = 93339025920. Its totient is φ = 3782246400.

The previous prime is 21031210183. The next prime is 21031210201. The reversal of 21031210200 is 201213012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031210201) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 216816552 + ... + 216816648.

It is an arithmetic number, because the mean of its divisors is an integer number (81023460).

Almost surely, 2^21031210200 is an apocalyptic number.

21031210200 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 21031210200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46669512960).

21031210200 is an abundant number, since it is smaller than the sum of its proper divisors (72307815720).

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

21031210200 is a wasteful number, since it uses less digits than its factorization.

21031210200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 157 counting only the distinct ones).

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

Adding to 21031210200 its reverse (201213012), we get a palindrome (21232423212).

The spelling of 21031210200 in words is "twenty-one billion, thirty-one million, two hundred ten thousand, two hundred".