201021212020 has 48 divisors (see below), whose sum is σ = 423385522560. Its totient is φ = 80172284544.

The previous prime is 201021211997. The next prime is 201021212023. The reversal of 201021212020 is 20212120102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021212023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28636071 + ... + 28643089.

It is an arithmetic number, because the mean of its divisors is an integer number (8820531720).

Almost surely, 2^201021212020 is an apocalyptic number.

201021212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021212020 is an abundant number, since it is smaller than the sum of its proper divisors (222364310540).

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

201021212020 is a wasteful number, since it uses less digits than its factorization.

201021212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11032 (or 11030 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 201021212020 its reverse (20212120102), we get a palindrome (221233332122).

The spelling of 201021212020 in words is "two hundred one billion, twenty-one million, two hundred twelve thousand, twenty".