201021100220 has 48 divisors (see below), whose sum is σ = 436211951616. Its totient is φ = 77734248000.

The previous prime is 201021100123. The next prime is 201021100277. The reversal of 201021100220 is 22001120102.

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, 435065 + ... + 768975.

It is an arithmetic number, because the mean of its divisors is an integer number (9087748992).

Almost surely, 2^201021100220 is an apocalyptic number.

201021100220 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 201021100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218105975808).

201021100220 is an abundant number, since it is smaller than the sum of its proper divisors (235190851396).

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

201021100220 is a wasteful number, since it uses less digits than its factorization.

201021100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334922 (or 334920 counting only the distinct ones).

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

Adding to 201021100220 its reverse (22001120102), we get a palindrome (223022220322).

The spelling of 201021100220 in words is "two hundred one billion, twenty-one million, one hundred thousand, two hundred twenty".