210101220 has 288 divisors, whose sum is σ = 770515200. Its totient is φ = 46287360.

The previous prime is 210101189. The next prime is 210101273. The reversal of 210101220 is 22101012.

210101220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2531299 + ... + 2531381.

It is an arithmetic number, because the mean of its divisors is an integer number (2675400).

Almost surely, 2^210101220 is an apocalyptic number.

210101220 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 210101220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (385257600).

210101220 is an abundant number, since it is smaller than the sum of its proper divisors (560413980).

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

210101220 is a wasteful number, since it uses less digits than its factorization.

210101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 210101220 is about 14494.8687472498. The cubic root of 210101220 is about 594.4876789496.

Adding to 210101220 its reverse (22101012), we get a palindrome (232202232).

The spelling of 210101220 in words is "two hundred ten million, one hundred one thousand, two hundred twenty".