210221210220 has 72 divisors (see below), whose sum is σ = 684720522864. Its totient is φ = 48050561664.

The previous prime is 210221210057. The next prime is 210221210239. The reversal of 210221210220 is 22012122012.

It is a super-2 number, since 2×210221210220² (a number of 23 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 210221210220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35748967 + ... + 35754846.

It is an arithmetic number, because the mean of its divisors is an integer number (9510007262).

Almost surely, 2^210221210220 is an apocalyptic number.

210221210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221210220 is an abundant number, since it is smaller than the sum of its proper divisors (474499312644).

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

210221210220 is a wasteful number, since it uses less digits than its factorization.

210221210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71503839 (or 71503830 counting only the distinct ones).

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

Adding to 210221210220 its reverse (22012122012), we get a palindrome (232233332232).

The spelling of 210221210220 in words is "two hundred ten billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty".