121211112013 has 2 divisors, whose sum is σ = 121211112014. Its totient is φ = 121211112012.

The previous prime is 121211111999. The next prime is 121211112041. The reversal of 121211112013 is 310211112121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117294605289 + 3916506724 = 342483^2 + 62582^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211112013 - 2⁹ = 121211111501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121211122013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605556006 + 60605556007.

It is an arithmetic number, because the mean of its divisors is an integer number (60605556007).

Almost surely, 2^121211112013 is an apocalyptic number.

It is an amenable number.

121211112013 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211112013 is an equidigital number, since it uses as much as digits as its factorization.

121211112013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 121211112013 its reverse (310211112121), we get a palindrome (431422224134).

The spelling of 121211112013 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred twelve thousand, thirteen".