9712121110111 has 24 divisors (see below), whose sum is σ = 11173890139776. Its totient is φ = 8269298505840.

The previous prime is 9712121110049. The next prime is 9712121110117. The reversal of 9712121110111 is 1110111212179.

It is not a de Polignac number, because 9712121110111 - 2⁹ = 9712121109599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9712121110111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9712121110117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 306679500 + ... + 306711166.

It is an arithmetic number, because the mean of its divisors is an integer number (465578755824).

Almost surely, 2^{9712121110111} is an apocalyptic number.

9712121110111 is a deficient number, since it is larger than the sum of its proper divisors (1461769029665).

9712121110111 is a wasteful number, since it uses less digits than its factorization.

9712121110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33579 (or 33412 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 28.

The spelling of 9712121110111 in words is "nine trillion, seven hundred twelve billion, one hundred twenty-one million, one hundred ten thousand, one hundred eleven".