121010012111 has 4 divisors (see below), whose sum is σ = 121010899272. Its totient is φ = 121009124952.

The previous prime is 121010012077. The next prime is 121010012113. The reversal of 121010012111 is 111210010121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121010012111 - 2⁶ = 121010012047 is a prime.

It is a super-2 number, since 2×121010012111² (a number of 23 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 = 121010012092 and 121010012101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121010012113) 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, 191060 + ... + 527753.

It is an arithmetic number, because the mean of its divisors is an integer number (30252724818).

Almost surely, 2^121010012111 is an apocalyptic number.

121010012111 is a deficient number, since it is larger than the sum of its proper divisors (887161).

121010012111 is an equidigital number, since it uses as much as digits as its factorization.

121010012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887160.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 121010012111 its reverse (111210010121), we get a palindrome (232220022232).

The spelling of 121010012111 in words is "one hundred twenty-one billion, ten million, twelve thousand, one hundred eleven".