21031220021300 has 144 divisors (see below), whose sum is σ = 48349207452672. Its totient is φ = 7929199948800.

The previous prime is 21031220021291. The next prime is 21031220021351. The reversal of 21031220021300 is 312002213012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22041929 + ... + 22976271.

It is an arithmetic number, because the mean of its divisors is an integer number (335758385088).

Almost surely, 2^{21031220021300} is an apocalyptic number.

21031220021300 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 21031220021300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24174603726336).

21031220021300 is an abundant number, since it is smaller than the sum of its proper divisors (27317987431372).

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

21031220021300 is a wasteful number, since it uses less digits than its factorization.

21031220021300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934578 (or 934571 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21031220021300 its reverse (312002213012), we get a palindrome (21343222234312).

The spelling of 21031220021300 in words is "twenty-one trillion, thirty-one billion, two hundred twenty million, twenty-one thousand, three hundred".