121021100011111 has 4 divisors (see below), whose sum is σ = 123596017032672. Its totient is φ = 118446182989552.

The previous prime is 121021100011103. The next prime is 121021100011121. The reversal of 121021100011111 is 111110001120121.

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 121021100011111 - 2³ = 121021100011103 is a prime.

It is a super-2 number, since 2×121021100011111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121021100011091 and 121021100011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021100011121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287458510710 + ... + 1287458510803.

It is an arithmetic number, because the mean of its divisors is an integer number (30899004258168).

Almost surely, 2^{121021100011111} is an apocalyptic number.

121021100011111 is a deficient number, since it is larger than the sum of its proper divisors (2574917021561).

121021100011111 is an equidigital number, since it uses as much as digits as its factorization.

121021100011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574917021560.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 121021100011111 its reverse (111110001120121), we get a palindrome (232131101131232).

The spelling of 121021100011111 in words is "one hundred twenty-one trillion, twenty-one billion, one hundred million, eleven thousand, one hundred eleven".