210221212020 has 96 divisors (see below), whose sum is σ = 608500408320. Its totient is φ = 54170878080.

The previous prime is 210221212013. The next prime is 210221212037. The reversal of 210221212020 is 20212122012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1187641 + ... + 1353119.

It is an arithmetic number, because the mean of its divisors is an integer number (6338545920).

Almost surely, 2^210221212020 is an apocalyptic number.

210221212020 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 210221212020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304250204160).

210221212020 is an abundant number, since it is smaller than the sum of its proper divisors (398279196300).

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

210221212020 is a wasteful number, since it uses less digits than its factorization.

210221212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166205 (or 166203 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 210221212020 its reverse (20212122012), we get a palindrome (230433334032).

The spelling of 210221212020 in words is "two hundred ten billion, two hundred twenty-one million, two hundred twelve thousand, twenty".