21020103031200 has 576 divisors, whose sum is σ = 84371854355712. Its totient is φ = 4426474291200.

The previous prime is 21020103031163. The next prime is 21020103031223. The reversal of 21020103031200 is 213030102012.

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 21020103031200.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 113694034 + ... + 113878766.

It is an arithmetic number, because the mean of its divisors is an integer number (146478913812).

Almost surely, 2^{21020103031200} is an apocalyptic number.

21020103031200 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 21020103031200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42185927177856).

21020103031200 is an abundant number, since it is smaller than the sum of its proper divisors (63351751324512).

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

21020103031200 is a wasteful number, since it uses less digits than its factorization.

21020103031200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185297 (or 185284 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21020103031200 its reverse (213030102012), we get a palindrome (21233133133212).

The spelling of 21020103031200 in words is "twenty-one trillion, twenty billion, one hundred three million, thirty-one thousand, two hundred".