21031031110200 has 192 divisors, whose sum is σ = 65920429260000. Its totient is φ = 5546304215040.

The previous prime is 21031031110181. The next prime is 21031031110213. The reversal of 21031031110200 is 201113013012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21031031110200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19958962 + ... + 20986238.

Almost surely, 2^{21031031110200} is an apocalyptic number.

21031031110200 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 21031031110200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32960214630000).

21031031110200 is an abundant number, since it is smaller than the sum of its proper divisors (44889398149800).

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

21031031110200 is a wasteful number, since it uses less digits than its factorization.

21031031110200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027674 (or 1027665 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21031031110200 its reverse (201113013012), we get a palindrome (21232144123212).

The spelling of 21031031110200 in words is "twenty-one trillion, thirty-one billion, thirty-one million, one hundred ten thousand, two hundred".