21020202000 has 320 divisors, whose sum is σ = 86057587200. Its totient is φ = 4804531200.

The previous prime is 21020201977. The next prime is 21020202059. The reversal of 21020202000 is 20202012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 350196 + ... + 405804.

It is an arithmetic number, because the mean of its divisors is an integer number (268929960).

Almost surely, 2^21020202000 is an apocalyptic number.

21020202000 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 21020202000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43028793600).

21020202000 is an abundant number, since it is smaller than the sum of its proper divisors (65037385200).

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

21020202000 is a wasteful number, since it uses less digits than its factorization.

21020202000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55648 (or 55626 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 21020202000 its reverse (20202012), we get a palindrome (21040404012).

The spelling of 21020202000 in words is "twenty-one billion, twenty million, two hundred two thousand".