21123321200300 has 144 divisors (see below), whose sum is σ = 52951800867840. Its totient is φ = 7228595328000.

The previous prime is 21123321200299. The next prime is 21123321200381. The reversal of 21123321200300 is 300212332112.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 189917705 + ... + 190028895.

It is an arithmetic number, because the mean of its divisors is an integer number (367720839360).

Almost surely, 2^{21123321200300} is an apocalyptic number.

21123321200300 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 21123321200300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26475900433920).

21123321200300 is an abundant number, since it is smaller than the sum of its proper divisors (31828479667540).

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

21123321200300 is a wasteful number, since it uses less digits than its factorization.

21123321200300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121392 (or 121385 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21123321200300 its reverse (300212332112), we get a palindrome (21423533532412).

The spelling of 21123321200300 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred twenty-one million, two hundred thousand, three hundred".