1221200120210 has 64 divisors (see below), whose sum is σ = 2548648800000. Its totient is φ = 412628815872.

The previous prime is 1221200120209. The next prime is 1221200120221. The reversal of 1221200120210 is 120210021221.

It is a Harshad number since it is a multiple of its sum of digits (14).

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 31 ways as a sum of consecutive naturals, for example, 6286721 + ... + 6478059.

It is an arithmetic number, because the mean of its divisors is an integer number (39822637500).

Almost surely, 2^{1221200120210} is an apocalyptic number.

1221200120210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221200120210 is an abundant number, since it is smaller than the sum of its proper divisors (1327448679790).

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

1221200120210 is a wasteful number, since it uses less digits than its factorization.

1221200120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192675.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221200120210 its reverse (120210021221), we get a palindrome (1341410141431).

The spelling of 1221200120210 in words is "one trillion, two hundred twenty-one billion, two hundred million, one hundred twenty thousand, two hundred ten".