21000201220000 has 120 divisors (see below), whose sum is σ = 51908506860672. Its totient is φ = 8360268000000.

The previous prime is 21000201219967. The next prime is 21000201220001. The reversal of 21000201220000 is 2210200012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21000201220001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1731825 + ... + 6708175.

Almost surely, 2^{21000201220000} is an apocalyptic number.

21000201220000 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 21000201220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25954253430336).

21000201220000 is an abundant number, since it is smaller than the sum of its proper divisors (30908305640672).

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

21000201220000 is an equidigital number, since it uses as much as digits as its factorization.

21000201220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4976592 (or 4976569 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21000201220000 its reverse (2210200012), we get a palindrome (21002411420012).

The spelling of 21000201220000 in words is "twenty-one trillion, two hundred one million, two hundred twenty thousand".