121310121221111 has 4 divisors (see below), whose sum is σ = 121793428477224. Its totient is φ = 120826813965000.

The previous prime is 121310121221101. The next prime is 121310121221119. The reversal of 121310121221111 is 111122121013121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121310121221111 - 2³⁴ = 121292941351927 is a prime.

It is a super-2 number, since 2×121310121221111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121310121221119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241653627680 + ... + 241653628181.

It is an arithmetic number, because the mean of its divisors is an integer number (30448357119306).

Almost surely, 2^{121310121221111} is an apocalyptic number.

121310121221111 is a deficient number, since it is larger than the sum of its proper divisors (483307256113).

121310121221111 is an equidigital number, since it uses as much as digits as its factorization.

121310121221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483307256112.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 121310121221111 its reverse (111122121013121), we get a palindrome (232432242234232).

The spelling of 121310121221111 in words is "one hundred twenty-one trillion, three hundred ten billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred eleven".