1223440421 has 4 divisors (see below), whose sum is σ = 1398217632. Its totient is φ = 1048663212.

The previous prime is 1223440417. The next prime is 1223440423. The reversal of 1223440421 is 1240443221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1240443221 = 239 ⋅5190139.

It is a cyclic number.

It is not a de Polignac number, because 1223440421 - 2² = 1223440417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223440423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87388595 + ... + 87388608.

It is an arithmetic number, because the mean of its divisors is an integer number (349554408).

Almost surely, 2^1223440421 is an apocalyptic number.

It is an amenable number.

1223440421 is a deficient number, since it is larger than the sum of its proper divisors (174777211).

1223440421 is an equidigital number, since it uses as much as digits as its factorization.

1223440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174777210.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1223440421 is about 34977.7132042677. The cubic root of 1223440421 is about 1069.5332115382.

Adding to 1223440421 its reverse (1240443221), we get a palindrome (2463883642).

The spelling of 1223440421 in words is "one billion, two hundred twenty-three million, four hundred forty thousand, four hundred twenty-one".