1221322123011 has 16 divisors (see below), whose sum is σ = 1649383324160. Its totient is φ = 803742095520.

The previous prime is 1221322122989. The next prime is 1221322123013. The reversal of 1221322123011 is 1103212231221.

It is not a de Polignac number, because 1221322123011 - 2⁹ = 1221322122499 is a prime.

It is a super-2 number, since 2×1221322123011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221322123013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 621996 + ... + 1682118.

It is an arithmetic number, because the mean of its divisors is an integer number (103086457760).

Almost surely, 2^{1221322123011} is an apocalyptic number.

1221322123011 is a deficient number, since it is larger than the sum of its proper divisors (428061201149).

1221322123011 is a wasteful number, since it uses less digits than its factorization.

1221322123011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065066.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1221322123011 its reverse (1103212231221), we get a palindrome (2324534354232).

The spelling of 1221322123011 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-two million, one hundred twenty-three thousand, eleven".