1231101330321 has 16 divisors (see below), whose sum is σ = 1829500430400. Its totient is φ = 731800171008.

The previous prime is 1231101330293. The next prime is 1231101330341. The reversal of 1231101330321 is 1230331011321.

It is a happy number.

It is not a de Polignac number, because 1231101330321 - 2²⁷ = 1230967112593 is a prime.

It is a super-2 number, since 2×1231101330321² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231101330341) 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, 635242236 + ... + 635244173.

It is an arithmetic number, because the mean of its divisors is an integer number (114343776900).

Almost surely, 2^{1231101330321} is an apocalyptic number.

It is an amenable number.

1231101330321 is a deficient number, since it is larger than the sum of its proper divisors (598399100079).

1231101330321 is a wasteful number, since it uses less digits than its factorization.

1231101330321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270486448.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 1231101330321 its reverse (1230331011321), we get a palindrome (2461432341642).

The spelling of 1231101330321 in words is "one trillion, two hundred thirty-one billion, one hundred one million, three hundred thirty thousand, three hundred twenty-one".