210221201020 has 24 divisors (see below), whose sum is σ = 451731140784. Its totient is φ = 82132934016.

The previous prime is 210221200963. The next prime is 210221201027. The reversal of 210221201020 is 20102122012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221201027) 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, 122220769 + ... + 122222488.

It is an arithmetic number, because the mean of its divisors is an integer number (18822130866).

Almost surely, 2^210221201020 is an apocalyptic number.

210221201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221201020 is an abundant number, since it is smaller than the sum of its proper divisors (241509939764).

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

210221201020 is a wasteful number, since it uses less digits than its factorization.

210221201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244443309 (or 244443307 counting only the distinct ones).

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

Adding to 210221201020 its reverse (20102122012), we get a palindrome (230323323032).

The spelling of 210221201020 in words is "two hundred ten billion, two hundred twenty-one million, two hundred one thousand, twenty".