21220221302000 has 320 divisors, whose sum is σ = 59825900968704. Its totient is φ = 7128803635200.

The previous prime is 21220221301991. The next prime is 21220221302009. The reversal of 21220221302000 is 20312202212.

It is an interprime number because it is at equal distance from previous prime (21220221301991) and next prime (21220221302009).

It is a self number, because there is not a number n which added to its sum of digits gives 21220221302000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220221302009) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 573547502 + ... + 573584498.

Almost surely, 2^{21220221302000} is an apocalyptic number.

21220221302000 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 21220221302000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29912950484352).

21220221302000 is an abundant number, since it is smaller than the sum of its proper divisors (38605679666704).

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

21220221302000 is a wasteful number, since it uses less digits than its factorization.

21220221302000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37853 (or 37837 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21220221302000 its reverse (20312202212), we get a palindrome (21240533504212).

The spelling of 21220221302000 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, three hundred two thousand".