1221010111222 has 16 divisors (see below), whose sum is σ = 2017798891344. Its totient is φ = 549509500000.

The previous prime is 1221010111219. The next prime is 1221010111253. The reversal of 1221010111222 is 2221110101221.

It is a junction number, because it is equal to n+sod(n) for n = 1221010111196 and 1221010111205.

It is a congruent number.

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, 274752529 + ... + 274756972.

It is an arithmetic number, because the mean of its divisors is an integer number (126112430709).

Almost surely, 2^{1221010111222} is an apocalyptic number.

1221010111222 is a deficient number, since it is larger than the sum of its proper divisors (796788780122).

1221010111222 is a wasteful number, since it uses less digits than its factorization.

1221010111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549509615.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221010111222 its reverse (2221110101221), we get a palindrome (3442120212443).

The spelling of 1221010111222 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred eleven thousand, two hundred twenty-two".