20021200000 has 96 divisors (see below), whose sum is σ = 49855285620. Its totient is φ = 8008320000.

The previous prime is 20021199977. The next prime is 20021200021. The reversal of 20021200000 is 212002.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 36288576 + 19984911424 = 6024^2 + 141368^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 374974 + ... + 425026.

Almost surely, 2^20021200000 is an apocalyptic number.

20021200000 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 20021200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24927642810).

20021200000 is an abundant number, since it is smaller than the sum of its proper divisors (29834085620).

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

20021200000 is an frugal number, since it uses more digits than its factorization.

20021200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50092 (or 50060 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

Adding to 20021200000 its reverse (212002), we get a palindrome (20021412002).

The spelling of 20021200000 in words is "twenty billion, twenty-one million, two hundred thousand".