1214312521 has 4 divisors (see below), whose sum is σ = 1237224132. Its totient is φ = 1191400912.

The previous prime is 1214312513. The next prime is 1214312549. The reversal of 1214312521 is 1252134121.

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 902401600 + 311910921 = 30040^2 + 17661^2 .

It is a cyclic number.

It is not a de Polignac number, because 1214312521 - 2³ = 1214312513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1214312492 and 1214312501.

It is not an unprimeable number, because it can be changed into a prime (1214312321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11455726 + ... + 11455831.

It is an arithmetic number, because the mean of its divisors is an integer number (309306033).

Almost surely, 2^1214312521 is an apocalyptic number.

It is an amenable number.

1214312521 is a deficient number, since it is larger than the sum of its proper divisors (22911611).

1214312521 is an equidigital number, since it uses as much as digits as its factorization.

1214312521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22911610.

The product of its digits is 480, while the sum is 22.

The square root of 1214312521 is about 34846.9872585852. The cubic root of 1214312521 is about 1066.8666949849.

Adding to 1214312521 its reverse (1252134121), we get a palindrome (2466446642).

The spelling of 1214312521 in words is "one billion, two hundred fourteen million, three hundred twelve thousand, five hundred twenty-one".