21010220000 has 360 divisors, whose sum is σ = 65626961400. Its totient is φ = 6545280000.

The previous prime is 21010219973. The next prime is 21010220017. The reversal of 21010220000 is 2201012.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21010220000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 10779026 + ... + 10780974.

It is an arithmetic number, because the mean of its divisors is an integer number (182297115).

Almost surely, 2^21010220000 is an apocalyptic number.

21010220000 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 21010220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32813480700).

21010220000 is an abundant number, since it is smaller than the sum of its proper divisors (44616741400).

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

21010220000 is a wasteful number, since it uses less digits than its factorization.

21010220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004 (or 1974 counting only the distinct ones).

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

Adding to 21010220000 its reverse (2201012), we get a palindrome (21012421012).

The spelling of 21010220000 in words is "twenty-one billion, ten million, two hundred twenty thousand".