1221210210 has 64 divisors (see below), whose sum is σ = 3225744000. Its totient is φ = 293422080.

The previous prime is 1221210209. The next prime is 1221210223. The reversal of 1221210210 is 120121221.

1221210210 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20916 + ... + 53664.

It is an arithmetic number, because the mean of its divisors is an integer number (50402250).

Almost surely, 2^1221210210 is an apocalyptic number.

1221210210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221210210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612872000).

1221210210 is an abundant number, since it is smaller than the sum of its proper divisors (2004533790).

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

1221210210 is a wasteful number, since it uses less digits than its factorization.

1221210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32883.

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

The square root of 1221210210 is about 34945.8182047581. The cubic root of 1221210210 is about 1068.8829317912.

Adding to 1221210210 its reverse (120121221), we get a palindrome (1341331431).

It can be divided in two parts, 12212 and 10210, that added together give a palindrome (22422).

The spelling of 1221210210 in words is "one billion, two hundred twenty-one million, two hundred ten thousand, two hundred ten".