2121123311213 has 2 divisors, whose sum is σ = 2121123311214. Its totient is φ = 2121123311212.

The previous prime is 2121123311137. The next prime is 2121123311227. The reversal of 2121123311213 is 3121133211212.

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., 1198626453124 + 922496858089 = 1094818^2 + 960467^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121123311213 - 2¹² = 2121123307117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121123313213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060561655606 + 1060561655607.

It is an arithmetic number, because the mean of its divisors is an integer number (1060561655607).

Almost surely, 2^{2121123311213} is an apocalyptic number.

It is an amenable number.

2121123311213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121123311213 is an equidigital number, since it uses as much as digits as its factorization.

2121123311213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

Adding to 2121123311213 its reverse (3121133211212), we get a palindrome (5242256522425).

The spelling of 2121123311213 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, three hundred eleven thousand, two hundred thirteen".