21200020000 has 240 divisors, whose sum is σ = 57645447552. Its totient is φ = 7631360000.

The previous prime is 21200019961. The next prime is 21200020021. The reversal of 21200020000 is 2000212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7818645 + ... + 7821355.

Almost surely, 2^21200020000 is an apocalyptic number.

21200020000 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 21200020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28822723776).

21200020000 is an abundant number, since it is smaller than the sum of its proper divisors (36445427552).

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

21200020000 is a wasteful number, since it uses less digits than its factorization.

21200020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781 (or 2758 counting only the distinct ones).

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

Adding to 21200020000 its reverse (2000212), we get a palindrome (21202020212).

The spelling of 21200020000 in words is "twenty-one billion, two hundred million, twenty thousand".