21000220221300 has 72 divisors (see below), whose sum is σ = 63402404028096. Its totient is φ = 5356577909760.

The previous prime is 21000220221223. The next prime is 21000220221347. The reversal of 21000220221300 is 312202200012.

It is a happy number.

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 21000220221300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1521748189 + ... + 1521761988.

Almost surely, 2^{21000220221300} is an apocalyptic number.

21000220221300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000220221300 is an abundant number, since it is smaller than the sum of its proper divisors (42402183806796).

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

21000220221300 is a wasteful number, since it uses less digits than its factorization.

21000220221300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043510217 (or 3043510210 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21000220221300 its reverse (312202200012), we get a palindrome (21312422421312).

The spelling of 21000220221300 in words is "twenty-one trillion, two hundred twenty million, two hundred twenty-one thousand, three hundred".