1221110210222 has 16 divisors (see below), whose sum is σ = 2216468953440. Its totient is φ = 492548656128.

The previous prime is 1221110210213. The next prime is 1221110210269. The reversal of 1221110210222 is 2220120111221.

It is a super-2 number, since 2×1221110210222² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 1221110210222.

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, 2565357347 + ... + 2565357822.

It is an arithmetic number, because the mean of its divisors is an integer number (138529309590).

Almost surely, 2^{1221110210222} is an apocalyptic number.

1221110210222 is a deficient number, since it is larger than the sum of its proper divisors (995358743218).

1221110210222 is a wasteful number, since it uses less digits than its factorization.

1221110210222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130715195.

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

Adding to 1221110210222 its reverse (2220120111221), we get a palindrome (3441230321443).

Subtracting 1221110210222 from its reverse (2220120111221), we obtain a palindrome (999009900999).

The spelling of 1221110210222 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, two hundred ten thousand, two hundred twenty-two".