121001111109 has 24 divisors (see below), whose sum is σ = 176359274520. Its totient is φ = 79938496512.

The previous prime is 121001111069. The next prime is 121001111131. The reversal of 121001111109 is 901111100121.

It can be written as a sum of positive squares in 4 ways, for example, as 47044308609 + 73956802500 = 216897^2 + 271950^2 .

It is not a de Polignac number, because 121001111109 - 2⁹ = 121001110597 is a prime.

It is a super-2 number, since 2×121001111109² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121001111091 and 121001111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001111159) 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, 8829867 + ... + 8843559.

It is an arithmetic number, because the mean of its divisors is an integer number (7348303105).

Almost surely, 2^121001111109 is an apocalyptic number.

It is an amenable number.

121001111109 is a deficient number, since it is larger than the sum of its proper divisors (55358163411).

121001111109 is a wasteful number, since it uses less digits than its factorization.

121001111109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22501 (or 22498 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 18.

The spelling of 121001111109 in words is "one hundred twenty-one billion, one million, one hundred eleven thousand, one hundred nine".