1212421013 has 4 divisors (see below), whose sum is σ = 1212535308. Its totient is φ = 1212306720.

The previous prime is 1212421003. The next prime is 1212421037. The reversal of 1212421013 is 3101242121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3101242121 = 397 ⋅7811693.

It can be written as a sum of positive squares in 2 ways, for example, as 565583524 + 646837489 = 23782^2 + 25433^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212421013 - 2²⁴ = 1195643797 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212420982 and 1212421000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212421003) 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, 39398 + ... + 63063.

It is an arithmetic number, because the mean of its divisors is an integer number (303133827).

Almost surely, 2^1212421013 is an apocalyptic number.

It is an amenable number.

1212421013 is a deficient number, since it is larger than the sum of its proper divisors (114295).

1212421013 is a wasteful number, since it uses less digits than its factorization.

1212421013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114294.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1212421013 is about 34819.8364872669. The cubic root of 1212421013 is about 1066.3124621569.

Adding to 1212421013 its reverse (3101242121), we get a palindrome (4313663134).

The spelling of 1212421013 in words is "one billion, two hundred twelve million, four hundred twenty-one thousand, thirteen".