1221200021210 has 64 divisors (see below), whose sum is σ = 2382447779712. Its totient is φ = 448011254016.

The previous prime is 1221200021203. The next prime is 1221200021221. The reversal of 1221200021210 is 121200021221.

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 31 ways as a sum of consecutive naturals, for example, 109059332 + ... + 109070528.

It is an arithmetic number, because the mean of its divisors is an integer number (37225746558).

Almost surely, 2^{1221200021210} is an apocalyptic number.

1221200021210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221200021210 is a deficient number, since it is larger than the sum of its proper divisors (1161247758502).

1221200021210 is a wasteful number, since it uses less digits than its factorization.

1221200021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16527.

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

Adding to 1221200021210 its reverse (121200021221), we get a palindrome (1342400042431).

The spelling of 1221200021210 in words is "one trillion, two hundred twenty-one billion, two hundred million, twenty-one thousand, two hundred ten".