121021012111211 has 4 divisors (see below), whose sum is σ = 122725533408624. Its totient is φ = 119316490813800.

The previous prime is 121021012111201. The next prime is 121021012111231. The reversal of 121021012111211 is 112111210120121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121021012111211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121021012111211.

It is not an unprimeable number, because it can be changed into a prime (121021012111201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852260648600 + ... + 852260648741.

It is an arithmetic number, because the mean of its divisors is an integer number (30681383352156).

Almost surely, 2^{121021012111211} is an apocalyptic number.

121021012111211 is a deficient number, since it is larger than the sum of its proper divisors (1704521297413).

121021012111211 is an equidigital number, since it uses as much as digits as its factorization.

121021012111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704521297412.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 121021012111211 its reverse (112111210120121), we get a palindrome (233132222231332).

The spelling of 121021012111211 in words is "one hundred twenty-one trillion, twenty-one billion, twelve million, one hundred eleven thousand, two hundred eleven".