1231223300221 has 16 divisors (see below), whose sum is σ = 1306742673600. Its totient is φ = 1156048922880.

The previous prime is 1231223300173. The next prime is 1231223300239. The reversal of 1231223300221 is 1220033221321.

It is a cyclic number.

It is not a de Polignac number, because 1231223300221 - 2¹³ = 1231223292029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231223300192 and 1231223300201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231223300291) 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, 39766855 + ... + 39797803.

It is an arithmetic number, because the mean of its divisors is an integer number (81671417100).

Almost surely, 2^{1231223300221} is an apocalyptic number.

It is an amenable number.

1231223300221 is a deficient number, since it is larger than the sum of its proper divisors (75519373379).

1231223300221 is a wasteful number, since it uses less digits than its factorization.

1231223300221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36444.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1231223300221 its reverse (1220033221321), we get a palindrome (2451256521542).

The spelling of 1231223300221 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-three million, three hundred thousand, two hundred twenty-one".