1213234121 has 16 divisors (see below), whose sum is σ = 1433982528. Its totient is φ = 1013913600.

The previous prime is 1213234093. The next prime is 1213234133. The reversal of 1213234121 is 1214323121.

It is a cyclic number.

It is not a de Polignac number, because 1213234121 - 2¹⁴ = 1213217737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213234093 and 1213234102.

It is not an unprimeable number, because it can be changed into a prime (1213234021) 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, 67400 + ... + 83481.

It is an arithmetic number, because the mean of its divisors is an integer number (89623908).

Almost surely, 2^1213234121 is an apocalyptic number.

1213234121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213234121 is a deficient number, since it is larger than the sum of its proper divisors (220748407).

1213234121 is a wasteful number, since it uses less digits than its factorization.

1213234121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150952.

The product of its digits is 288, while the sum is 20.

The square root of 1213234121 is about 34831.5104610753. The cubic root of 1213234121 is about 1066.5507824084.

Adding to 1213234121 its reverse (1214323121), we get a palindrome (2427557242).

The spelling of 1213234121 in words is "one billion, two hundred thirteen million, two hundred thirty-four thousand, one hundred twenty-one".