1231422143221 has 4 divisors (see below), whose sum is σ = 1231446390412. Its totient is φ = 1231397896032.

The previous prime is 1231422143213. The next prime is 1231422143249. The reversal of 1231422143221 is 1223412241321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 592199507025 + 639222636196 = 769545^2 + 799514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231422143221 - 2³ = 1231422143213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231422143221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231422143291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12047256 + ... + 12149041.

It is an arithmetic number, because the mean of its divisors is an integer number (307861597603).

Almost surely, 2^{1231422143221} is an apocalyptic number.

It is an amenable number.

1231422143221 is a deficient number, since it is larger than the sum of its proper divisors (24247191).

1231422143221 is an equidigital number, since it uses as much as digits as its factorization.

1231422143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24247190.

The product of its digits is 4608, while the sum is 28.

Adding to 1231422143221 its reverse (1223412241321), we get a palindrome (2454834384542).

The spelling of 1231422143221 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-two million, one hundred forty-three thousand, two hundred twenty-one".