20001021021212 has 24 divisors (see below), whose sum is σ = 43638591319680. Its totient is φ = 7792605592560.

The previous prime is 20001021021197. The next prime is 20001021021217. The reversal of 20001021021212 is 21212012010002.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001021021217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32469189662 + ... + 32469190277.

It is an arithmetic number, because the mean of its divisors is an integer number (1818274638320).

Almost surely, 2^{20001021021212} is an apocalyptic number.

20001021021212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20001021021212 is an abundant number, since it is smaller than the sum of its proper divisors (23637570298468).

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

20001021021212 is a wasteful number, since it uses less digits than its factorization.

20001021021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64938379961 (or 64938379959 counting only the distinct ones).

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

Adding to 20001021021212 its reverse (21212012010002), we get a palindrome (41213033031214).

The spelling of 20001021021212 in words is "twenty trillion, one billion, twenty-one million, twenty-one thousand, two hundred twelve".