1221100120210 has 16 divisors (see below), whose sum is σ = 2198385024192. Its totient is φ = 488350090800.

The previous prime is 1221100120193. The next prime is 1221100120237. The reversal of 1221100120210 is 120210011221.

It is a super-3 number, since 3×1221100120210³ (a number of 37 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11187636 + ... + 11296255.

It is an arithmetic number, because the mean of its divisors is an integer number (137399064012).

Almost surely, 2^{1221100120210} is an apocalyptic number.

1221100120210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221100120210 is a deficient number, since it is larger than the sum of its proper divisors (977284903982).

1221100120210 is a wasteful number, since it uses less digits than its factorization.

1221100120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22489329.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221100120210 its reverse (120210011221), we get a palindrome (1341310131431).

The spelling of 1221100120210 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty thousand, two hundred ten".