1213123430 has 16 divisors (see below), whose sum is σ = 2198085984. Its totient is φ = 482035200.

The previous prime is 1213123421. The next prime is 1213123433. The reversal of 1213123430 is 343213121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213123433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400187 + ... + 403206.

It is an arithmetic number, because the mean of its divisors is an integer number (137380374).

Almost surely, 2^1213123430 is an apocalyptic number.

1213123430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213123430 is a deficient number, since it is larger than the sum of its proper divisors (984962554).

1213123430 is a wasteful number, since it uses less digits than its factorization.

1213123430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803551.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1213123430 is about 34829.9214756508. The cubic root of 1213123430 is about 1066.5183453706.

Adding to 1213123430 its reverse (343213121), we get a palindrome (1556336551).

The spelling of 1213123430 in words is "one billion, two hundred thirteen million, one hundred twenty-three thousand, four hundred thirty".