1213212121213 has 2 divisors, whose sum is σ = 1213212121214. Its totient is φ = 1213212121212.

The previous prime is 1213212121171. The next prime is 1213212121237. The reversal of 1213212121213 is 3121212123121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 848954003769 + 364258117444 = 921387^2 + 603538^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213212121213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213213121213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606606060606 + 606606060607.

It is an arithmetic number, because the mean of its divisors is an integer number (606606060607).

Almost surely, 2^{1213212121213} is an apocalyptic number.

It is an amenable number.

1213212121213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213212121213 is an equidigital number, since it uses as much as digits as its factorization.

1213212121213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 22.

Adding to 1213212121213 its reverse (3121212123121), we get a palindrome (4334424244334).

The spelling of 1213212121213 in words is "one trillion, two hundred thirteen billion, two hundred twelve million, one hundred twenty-one thousand, two hundred thirteen".