121121221012111 has 16 divisors (see below), whose sum is σ = 128598874455040. Its totient is φ = 113894972674560.

The previous prime is 121121221012093. The next prime is 121121221012133. The reversal of 121121221012111 is 111210122121121.

It is a cyclic number.

It is not a de Polignac number, because 121121221012111 - 2⁵ = 121121221012079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121221082111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235140741 + ... + 235655278.

It is an arithmetic number, because the mean of its divisors is an integer number (8037429653440).

Almost surely, 2^{121121221012111} is an apocalyptic number.

121121221012111 is a deficient number, since it is larger than the sum of its proper divisors (7477653442929).

121121221012111 is a wasteful number, since it uses less digits than its factorization.

121121221012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470796286.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 121121221012111 its reverse (111210122121121), we get a palindrome (232331343133232).

The spelling of 121121221012111 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, twelve thousand, one hundred eleven".