1223444400421 has 4 divisors (see below), whose sum is σ = 1223892715500. Its totient is φ = 1222996085344.

The previous prime is 1223444400397. The next prime is 1223444400511. The reversal of 1223444400421 is 1240044443221.

It is a happy number.

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 540094177921 + 683350222500 = 734911^2 + 826650^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223444400421 - 2¹⁹ = 1223443876133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223444407421) 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 3 ways as a sum of consecutive naturals, for example, 224153446 + ... + 224158903.

It is an arithmetic number, because the mean of its divisors is an integer number (305973178875).

Almost surely, 2^{1223444400421} is an apocalyptic number.

It is an amenable number.

1223444400421 is a deficient number, since it is larger than the sum of its proper divisors (448315079).

1223444400421 is an equidigital number, since it uses as much as digits as its factorization.

1223444400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448315078.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 1223444400421 its reverse (1240044443221), we get a palindrome (2463488843642).

The spelling of 1223444400421 in words is "one trillion, two hundred twenty-three billion, four hundred forty-four million, four hundred thousand, four hundred twenty-one".