121021120011111 has 16 divisors (see below), whose sum is σ = 162349668071424. Its totient is φ = 80186977987424.

The previous prime is 121021120011091. The next prime is 121021120011227. The reversal of 121021120011111 is 111110021120121.

It is a cyclic number.

It is not a de Polignac number, because 121021120011111 - 2²¹ = 121021117913959 is a prime.

It is a super-2 number, since 2×121021120011111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021120711111) 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, 38313711 + ... + 41351936.

It is an arithmetic number, because the mean of its divisors is an integer number (10146854254464).

Almost surely, 2^{121021120011111} is an apocalyptic number.

121021120011111 is a deficient number, since it is larger than the sum of its proper divisors (41328548060313).

121021120011111 is a wasteful number, since it uses less digits than its factorization.

121021120011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79668750.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 121021120011111 its reverse (111110021120121), we get a palindrome (232131141131232).

The spelling of 121021120011111 in words is "one hundred twenty-one trillion, twenty-one billion, one hundred twenty million, eleven thousand, one hundred eleven".