1243223421 has 16 divisors (see below), whose sum is σ = 1857200448. Its totient is φ = 733104000.

The previous prime is 1243223389. The next prime is 1243223431.

It is a happy number.

1243223421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1243223421 - 2⁵ = 1243223389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243223391 and 1243223400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243223431) 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, 507880 + ... + 510321.

It is an arithmetic number, because the mean of its divisors is an integer number (116075028).

Almost surely, 2^1243223421 is an apocalyptic number.

1243223421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1243223421 is a deficient number, since it is larger than the sum of its proper divisors (613977027).

1243223421 is a wasteful number, since it uses less digits than its factorization.

1243223421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018252.

The product of its digits is 2304, while the sum is 24.

The square root of 1243223421 is about 35259.3735196756. The cubic root of 1243223421 is about 1075.2671904080.

It can be divided in two parts, 12432 and 23421, that added together give a palindrome (35853).

The spelling of 1243223421 in words is "one billion, two hundred forty-three million, two hundred twenty-three thousand, four hundred twenty-one".