1221220210210 has 288 divisors, whose sum is σ = 3020085927936. Its totient is φ = 347840064000.

The previous prime is 1221220210207. The next prime is 1221220210237. The reversal of 1221220210210 is 120120221221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 144570207 + ... + 144578653.

It is an arithmetic number, because the mean of its divisors is an integer number (10486409472).

Almost surely, 2^{1221220210210} is an apocalyptic number.

1221220210210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221220210210 is an abundant number, since it is smaller than the sum of its proper divisors (1798865717726).

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

1221220210210 is a wasteful number, since it uses less digits than its factorization.

1221220210210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8610 (or 8586 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221220210210 its reverse (120120221221), we get a palindrome (1341340431431).

The spelling of 1221220210210 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, two hundred ten".