1222111222021 has 16 divisors (see below), whose sum is σ = 1326022427520. Its totient is φ = 1121777579520.

The previous prime is 1222111221973. The next prime is 1222111222039. The reversal of 1222111222021 is 1202221112221.

It is a cyclic number.

It is not a de Polignac number, because 1222111222021 - 2⁹ = 1222111221509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222111222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222111225021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1708570 + ... + 2315908.

It is an arithmetic number, because the mean of its divisors is an integer number (82876401720).

Almost surely, 2^{1222111222021} is an apocalyptic number.

It is an amenable number.

1222111222021 is a deficient number, since it is larger than the sum of its proper divisors (103911205499).

1222111222021 is a wasteful number, since it uses less digits than its factorization.

1222111222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610284.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1222111222021 its reverse (1202221112221), we get a palindrome (2424332334242).

The spelling of 1222111222021 in words is "one trillion, two hundred twenty-two billion, one hundred eleven million, two hundred twenty-two thousand, twenty-one".