21021221303000 has 64 divisors (see below), whose sum is σ = 50776421080320. Its totient is φ = 8137246944000.

The previous prime is 21021221302951. The next prime is 21021221303003. The reversal of 21021221303000 is 30312212012.

It is a self number, because there is not a number n which added to its sum of digits gives 21021221303000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021221303003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339020957 + ... + 339082956.

It is an arithmetic number, because the mean of its divisors is an integer number (793381579380).

Almost surely, 2^{21021221303000} is an apocalyptic number.

21021221303000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021221303000 is an abundant number, since it is smaller than the sum of its proper divisors (29755199777320).

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

21021221303000 is a wasteful number, since it uses less digits than its factorization.

21021221303000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678103965 (or 678103951 counting only the distinct ones).

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

Adding to 21021221303000 its reverse (30312212012), we get a palindrome (21051533515012).

The spelling of 21021221303000 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-one million, three hundred three thousand".