21203220000 has 240 divisors, whose sum is σ = 71438032512. Its totient is φ = 5500800000.

The previous prime is 21203219953. The next prime is 21203220007. The reversal of 21203220000 is 2230212.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21203220007) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2215225 + ... + 2224775.

Almost surely, 2^21203220000 is an apocalyptic number.

21203220000 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 21203220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35719016256).

21203220000 is an abundant number, since it is smaller than the sum of its proper divisors (50234812512).

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

21203220000 is an equidigital number, since it uses as much as digits as its factorization.

21203220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9621 (or 9598 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 21203220000 its reverse (2230212), we get a palindrome (21205450212).

The spelling of 21203220000 in words is "twenty-one billion, two hundred three million, two hundred twenty thousand".