1221321132231 has 32 divisors (see below), whose sum is σ = 1740548113920. Its totient is φ = 761728869248.

The previous prime is 1221321132221. The next prime is 1221321132289. The reversal of 1221321132231 is 1322311231221.

It is not a de Polignac number, because 1221321132231 - 2¹³ = 1221321124039 is a prime.

It is a super-2 number, since 2×1221321132231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221321132221) 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 31 ways as a sum of consecutive naturals, for example, 2213320 + ... + 2709506.

It is an arithmetic number, because the mean of its divisors is an integer number (54392128560).

Almost surely, 2^{1221321132231} is an apocalyptic number.

1221321132231 is a deficient number, since it is larger than the sum of its proper divisors (519226981689).

1221321132231 is an equidigital number, since it uses as much as digits as its factorization.

1221321132231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496408 (or 496374 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

Adding to 1221321132231 its reverse (1322311231221), we get a palindrome (2543632363452).

The spelling of 1221321132231 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, one hundred thirty-two thousand, two hundred thirty-one".