210001221210 has 64 divisors (see below), whose sum is σ = 549865044864. Its totient is φ = 50905344000.

The previous prime is 210001221203. The next prime is 210001221211. The reversal of 210001221210 is 12122100012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210001221211) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 7840962 + ... + 7867698.

It is an arithmetic number, because the mean of its divisors is an integer number (8591641326).

Almost surely, 2^210001221210 is an apocalyptic number.

210001221210 is an abundant number, since it is smaller than the sum of its proper divisors (339863823654).

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

210001221210 is a wasteful number, since it uses less digits than its factorization.

210001221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50559.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210001221210 its reverse (12122100012), we get a palindrome (222123321222).

The spelling of 210001221210 in words is "two hundred ten billion, one million, two hundred twenty-one thousand, two hundred ten".