21112020123200 has 504 divisors, whose sum is σ = 56393555748096. Its totient is φ = 7770216960000.

The previous prime is 21112020123191. The next prime is 21112020123247. The reversal of 21112020123200 is 232102021112.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4539240875 + ... + 4539245525.

Almost surely, 2^{21112020123200} is an apocalyptic number.

21112020123200 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 21112020123200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28196777874048).

21112020123200 is an abundant number, since it is smaller than the sum of its proper divisors (35281535624896).

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

21112020123200 is a wasteful number, since it uses less digits than its factorization.

21112020123200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923 (or 4885 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21112020123200 its reverse (232102021112), we get a palindrome (21344122144312).

The spelling of 21112020123200 in words is "twenty-one trillion, one hundred twelve billion, twenty million, one hundred twenty-three thousand, two hundred".