105121989011 has 4 divisors (see below), whose sum is σ = 113208295872. Its totient is φ = 97035682152.

The previous prime is 105121989001. The next prime is 105121989029. The reversal of 105121989011 is 110989121501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105121989011 is a prime.

It is a super-2 number, since 2×105121989011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105121989001) 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, 4043153411 + ... + 4043153436.

It is an arithmetic number, because the mean of its divisors is an integer number (28302073968).

Almost surely, 2^105121989011 is an apocalyptic number.

105121989011 is a deficient number, since it is larger than the sum of its proper divisors (8086306861).

105121989011 is an equidigital number, since it uses as much as digits as its factorization.

105121989011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8086306860.

The product of its (nonzero) digits is 6480, while the sum is 38.

The spelling of 105121989011 in words is "one hundred five billion, one hundred twenty-one million, nine hundred eighty-nine thousand, eleven".