20001021212000 has 96 divisors (see below), whose sum is σ = 49529459266560. Its totient is φ = 7937412940800.

The previous prime is 20001021211673. The next prime is 20001021212017. The reversal of 20001021212000 is 21212010002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19178045 + ... + 20194044.

It is an arithmetic number, because the mean of its divisors is an integer number (515931867360).

Almost surely, 2^{20001021212000} is an apocalyptic number.

20001021212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001021212000 is an abundant number, since it is smaller than the sum of its proper divisors (29528438054560).

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

20001021212000 is a wasteful number, since it uses less digits than its factorization.

20001021212000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39372241 (or 39372223 counting only the distinct ones).

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

Adding to 20001021212000 its reverse (21212010002), we get a palindrome (20022233222002).

The spelling of 20001021212000 in words is "twenty trillion, one billion, twenty-one million, two hundred twelve thousand".