20021021210000 has 150 divisors (see below), whose sum is σ = 51491974895130. Its totient is φ = 7537324544000.

The previous prime is 20021021209993. The next prime is 20021021210089. The reversal of 20021021210000 is 1212012002.

It is a happy number.

It can be written as a sum of positive squares in 15 ways, for example, as 12460787040256 + 7560234169744 = 3529984^2 + 2749588^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 573845 + ... + 6353844.

Almost surely, 2^{20021021210000} is an apocalyptic number.

20021021210000 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 20021021210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25745987447565).

20021021210000 is an abundant number, since it is smaller than the sum of its proper divisors (31470953685130).

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

20021021210000 is an equidigital number, since it uses as much as digits as its factorization.

20021021210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6927751 (or 6927713 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021021210000 its reverse (1212012002), we get a palindrome (20022233222002).

The spelling of 20021021210000 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred ten thousand".