1221100022210 has 16 divisors (see below), whose sum is σ = 2198880526392. Its totient is φ = 488239900800.

The previous prime is 1221100022209. The next prime is 1221100022221. The reversal of 1221100022210 is 122200011221.

It can be written as a sum of positive squares in 4 ways, for example, as 1035548429161 + 185551593049 = 1017619^2 + 430757^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24987881 + ... + 25036700.

Almost surely, 2^{1221100022210} is an apocalyptic number.

1221100022210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221100022210 is a deficient number, since it is larger than the sum of its proper divisors (977780504182).

1221100022210 is a wasteful number, since it uses less digits than its factorization.

1221100022210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50027029.

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

Adding to 1221100022210 its reverse (122200011221), we get a palindrome (1343300033431).

The spelling of 1221100022210 in words is "one trillion, two hundred twenty-one billion, one hundred million, twenty-two thousand, two hundred ten".