1231001003221 has 16 divisors (see below), whose sum is σ = 1348921163520. Its totient is φ = 1114093854720.

The previous prime is 1231001003173. The next prime is 1231001003231. The reversal of 1231001003221 is 1223001001321.

It is not a de Polignac number, because 1231001003221 - 2¹⁵ = 1231000970453 is a prime.

It is a super-2 number, since 2×1231001003221² (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 = 1231001003195 and 1231001003204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231001003231) 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, 1926165 + ... + 2484373.

It is an arithmetic number, because the mean of its divisors is an integer number (84307572720).

Almost surely, 2^{1231001003221} is an apocalyptic number.

1231001003221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1231001003221 is a deficient number, since it is larger than the sum of its proper divisors (117920160299).

1231001003221 is a wasteful number, since it uses less digits than its factorization.

1231001003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559116.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1231001003221 its reverse (1223001001321), we get a palindrome (2454002004542).

The spelling of 1231001003221 in words is "one trillion, two hundred thirty-one billion, one million, three thousand, two hundred twenty-one".