21220221211300 has 72 divisors (see below), whose sum is σ = 46356068507840. Its totient is φ = 8431287408000.

The previous prime is 21220221211279. The next prime is 21220221211307. The reversal of 21220221211300 is 311212202212.

It is not an unprimeable number, because it can be changed into a prime (21220221211307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262986562 + ... + 263067238.

Almost surely, 2^{21220221211300} is an apocalyptic number.

21220221211300 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 21220221211300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23178034253920).

21220221211300 is an abundant number, since it is smaller than the sum of its proper divisors (25135847296540).

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

21220221211300 is a wasteful number, since it uses less digits than its factorization.

21220221211300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98261 (or 98254 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21220221211300 its reverse (311212202212), we get a palindrome (21531433413512).

The spelling of 21220221211300 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred eleven thousand, three hundred".