20121212413 has 2 divisors, whose sum is σ = 20121212414. Its totient is φ = 20121212412.

The previous prime is 20121212407. The next prime is 20121212467. The reversal of 20121212413 is 31421212102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17881840729 + 2239371684 = 133723^2 + 47322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121212413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121212213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060606206 + 10060606207.

It is an arithmetic number, because the mean of its divisors is an integer number (10060606207).

Almost surely, 2^20121212413 is an apocalyptic number.

It is an amenable number.

20121212413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121212413 is an equidigital number, since it uses as much as digits as its factorization.

20121212413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20121212413 its reverse (31421212102), we get a palindrome (51542424515).

The spelling of 20121212413 in words is "twenty billion, one hundred twenty-one million, two hundred twelve thousand, four hundred thirteen".