1221020211122 has 16 divisors (see below), whose sum is σ = 1944987953760. Its totient is φ = 573259603392.

The previous prime is 1221020211071. The next prime is 1221020211133. The reversal of 1221020211122 is 2211120201221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221020211122.

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, 142173188 + ... + 142181775.

It is an arithmetic number, because the mean of its divisors is an integer number (121561747110).

Almost surely, 2^{1221020211122} is an apocalyptic number.

1221020211122 is a deficient number, since it is larger than the sum of its proper divisors (723967742638).

1221020211122 is a wasteful number, since it uses less digits than its factorization.

1221020211122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284355097.

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

Adding to 1221020211122 its reverse (2211120201221), we get a palindrome (3432140412343).

Subtracting 1221020211122 from its reverse (2211120201221), we obtain a palindrome (990099990099).

The spelling of 1221020211122 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred eleven thousand, one hundred twenty-two".