20021210000 has 100 divisors (see below), whose sum is σ = 52880310384. Its totient is φ = 7280400000.

The previous prime is 20021209969. The next prime is 20021210057. The reversal of 20021210000 is 1212002.

It is a tau number, because it is divible by the number of its divisors (100).

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 20021210000.

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 19 ways as a sum of consecutive naturals, for example, 18995 + ... + 201005.

Almost surely, 2^20021210000 is an apocalyptic number.

20021210000 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 20021210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26440155192).

20021210000 is an abundant number, since it is smaller than the sum of its proper divisors (32859100384).

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

20021210000 is a wasteful number, since it uses less digits than its factorization.

20021210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182050 (or 182029 counting only the distinct ones).

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

Adding to 20021210000 its reverse (1212002), we get a palindrome (20022422002).

The spelling of 20021210000 in words is "twenty billion, twenty-one million, two hundred ten thousand".