21022000000 has 224 divisors, whose sum is σ = 54744611760. Its totient is φ = 8025600000.

The previous prime is 21021999989. The next prime is 21022000033. The reversal of 21022000000 is 22012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 45999772 + ... + 46000228.

Almost surely, 2^21022000000 is an apocalyptic number.

21022000000 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 21022000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27372305880).

21022000000 is an abundant number, since it is smaller than the sum of its proper divisors (33722611760).

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

21022000000 is an frugal number, since it uses more digits than its factorization.

21022000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524 (or 487 counting only the distinct ones).

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

Adding to 21022000000 its reverse (22012), we get a palindrome (21022022012).

The spelling of 21022000000 in words is "twenty-one billion, twenty-two million", and thus it is an aban number and an uban number.