1131222021221 has 16 divisors (see below), whose sum is σ = 1180315825920. Its totient is φ = 1083427445760.

The previous prime is 1131222021203. The next prime is 1131222021247. The reversal of 1131222021221 is 1221202221311.

It is a cyclic number.

It is not a de Polignac number, because 1131222021221 - 2²⁶ = 1131154912357 is a prime.

It is a super-2 number, since 2×1131222021221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131222021193 and 1131222021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131222029221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 988235 + ... + 1799736.

It is an arithmetic number, because the mean of its divisors is an integer number (73769739120).

Almost surely, 2^{1131222021221} is an apocalyptic number.

It is an amenable number.

1131222021221 is a deficient number, since it is larger than the sum of its proper divisors (49093804699).

1131222021221 is an equidigital number, since it uses as much as digits as its factorization.

1131222021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2788204.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1131222021221 its reverse (1221202221311), we get a palindrome (2352424242532).

The spelling of 1131222021221 in words is "one trillion, one hundred thirty-one billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".