20021021211200 has 168 divisors, whose sum is σ = 49372637002560. Its totient is φ = 7990801459200.

The previous prime is 20021021211199. The next prime is 20021021211203. The reversal of 20021021211200 is 211212012002.

It is not an unprimeable number, because it can be changed into a prime (20021021211203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1951551671 + ... + 1951561929.

Almost surely, 2^{20021021211200} is an apocalyptic number.

20021021211200 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 20021021211200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24686318501280).

20021021211200 is an abundant number, since it is smaller than the sum of its proper divisors (29351615791360).

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

20021021211200 is a wasteful number, since it uses less digits than its factorization.

20021021211200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12845 (or 12830 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20021021211200 its reverse (211212012002), we get a palindrome (20232233223202).

The spelling of 20021021211200 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred eleven thousand, two hundred".