121212110101 has 2 divisors, whose sum is σ = 121212110102. Its totient is φ = 121212110100.

The previous prime is 121212110039. The next prime is 121212110111. The reversal of 121212110101 is 101011212121.

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., 114294029476 + 6918080625 = 338074^2 + 83175^2 .

It is an emirp because it is prime and its reverse (101011212121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121212110101 - 2⁹ = 121212109589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121212110111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606055050 + 60606055051.

It is an arithmetic number, because the mean of its divisors is an integer number (60606055051).

Almost surely, 2^121212110101 is an apocalyptic number.

It is an amenable number.

121212110101 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212110101 is an equidigital number, since it uses as much as digits as its factorization.

121212110101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121212110101 its reverse (101011212121), we get a palindrome (222223322222).

It can be divided in two parts, 1212121 and 10101, that multiplied together give a palindrome (12243634221).

The spelling of 121212110101 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, one hundred one".