1220121221210 has 16 divisors (see below), whose sum is σ = 2197503318600. Its totient is φ = 487762906176.

The previous prime is 1220121221183. The next prime is 1220121221233. The reversal of 1220121221210 is 121221210221.

It can be written as a sum of positive squares in 4 ways, for example, as 470998081849 + 749123139361 = 686293^2 + 865519^2 .

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 7 ways as a sum of consecutive naturals, for example, 35679845 + ... + 35714024.

Almost surely, 2^{1220121221210} is an apocalyptic number.

1220121221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220121221210 is a deficient number, since it is larger than the sum of its proper divisors (977382097390).

1220121221210 is a wasteful number, since it uses less digits than its factorization.

1220121221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71395585.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1220121221210 its reverse (121221210221), we get a palindrome (1341342431431).

The spelling of 1220121221210 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred ten".