121021211120111 has 16 divisors (see below), whose sum is σ = 121794214291200. Its totient is φ = 120249303494400.

The previous prime is 121021211120057. The next prime is 121021211120129. The reversal of 121021211120111 is 111021112120121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121021211120111 is a prime.

It is a super-2 number, since 2×121021211120111² (a number of 29 digits) contains 22 as substring.

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 121021211120111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021213120111) 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, 3050601806 + ... + 3050641476.

It is an arithmetic number, because the mean of its divisors is an integer number (7612138393200).

Almost surely, 2^{121021211120111} is an apocalyptic number.

121021211120111 is a deficient number, since it is larger than the sum of its proper divisors (773003171089).

121021211120111 is a wasteful number, since it uses less digits than its factorization.

121021211120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52990.

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

Adding to 121021211120111 its reverse (111021112120121), we get a palindrome (232042323240232).

The spelling of 121021211120111 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred eleven million, one hundred twenty thousand, one hundred eleven".